How much would you pay for a 1.2Ghz dual-core ARM computer with 1GB RAM, 4GB onboard flash memory, 800×600 display and 5 megapixel camera? Did we mention that it also has WiFi, Bluetooth, and is a low-power design, including a lithium battery that can run for several hours? Does 15 dollars sound low enough? This is what you can pay for your Android phone now. The ruthless progress of economies of scale finally provided us with cheap phones with excellent specifications. These are prepaid "burner" phones, sold by operators as loss leaders. The cost is compensated in the cellular plan, but only when the buyer activates the plan. Unlike ordinary mobile phones, you are not bound by the contract to activate the mobile phone. This means you can get all these features for between 15 and 20 dollars, depending on where you buy them.
The specification I quoted is from LG Optimus Exceed 2, which is currently available from Amazon in the US for $20. In recent weeks, the same package can be purchased in retail stores for as low as $10. Exceed 2 is just one of several low-cost Android prepaid phones currently on the market, and there is no doubt that this list will change. How to keep up with current transactions? We found an unlikely place. Cheer up the farmers. Perk is one of those companies that "we pay you to watch ads". We are sure that some people will actually watch the ad, but most people will build a "farm" of drone phones and broadcast them via video. Drones earn farmer points, which can be converted into cash. How does all this help us? In order to handle streaming video, Perk farmers want to get the most powerful mobile phones with the lowest investment. Sub-sections like /r/perktv have weekly "best deal" posts covering prepaid calls. There are also tutorials on rooting and eliminating current popular phones (such as Whirl 2 and Exceed 2).
After owning a mobile phone, the first task is to activate it. Many prepaid phones try to force users to go through the activation process. Nevertheless, the installer always has a back door to exit the process. For Exceed 2, just press Increase Volume, Decrease Volume, Return and Home to exit the activation process.
Some applications require root privileges. The best way to do this is to do some Google searches for your specific phone model. The XDA Developer Forum is a great resource. Although prepaid phones generally don’t have the same community support as flagship phones, you can usually find at least some information you need on how to root a particular device. The most famous "root every device" application to date is the towel root created by GeoHot. You may remember [George Hotz] also known as GeoHot, he was the first person to jailbreak iPhone. He also became news by getting into trouble with Sony over some PlayStation 3 security breaches. Towelroot uses Linux kernel vulnerabilities (futex) to gain root privileges. The futex vulnerability was released in June 2014 and has been patched on most new phones. However, it has not yet patched phones that receive relatively few updates—such as prepaid phones. On Exceed 2, Towelroot works perfectly, even without rebooting to grant users root privileges. Once the phone has root access, a root access manager like SuperSU is needed to track which applications should have root access. Once it is done, everything will be fine! We found packages like BusyBox to be of great help-especially when working on the console via the Android Debug Bridge (ADB).
Between these low-cost phones and the second-hand phones that every family seems to be using now, there are many devices waiting to be used. What can you do with a spare Android phone? Much. Now is the best time to learn to code for the Android platform. Android Studio is currently the official development environment. If you know a little Java, it's easy to get started and start making applications. If you are not a Java mind but want to learn, there are many tutorials on the Internet that can help you understand the changes in things.
Not a programmer? For a long time, the Swiss Army Knife for automating Android devices has been Tasker. Tasker allows you to use triggers to start simple scripts (called tasks). These triggers can range from plugging in a headset to connecting to a specific WiFi access point to pressing a button on the screen. Want your smartphone to announce that you are home with your own theme music? Just set up a Tasker profile to play songs when it connects to your home WiFi router. Tasker itself supports a large number of operations and can be extended through plugins. Scripting Layer For Android SL4A) even allows it to be extended with Python scripts.
Entering the hardware world, there are many ways to get GPIO from an Android phone. The Android Accessory Development Kit (ADK) takes a long time to use, but it is still a good way to connect Arduino boards such as the Arduino Mega ADK with your device. Another option to enter the hardware field is the IOIO OTG board. As the name suggests, this new version of the IOIO board supports the USB OTG standard. This allows it to connect to the phone as a host or accessory. Does your project need a simple wireless terminal? Take a terminal application and a serial port profile (SPP) compatible Bluetooth module, Bob is your uncle. Are you interested in hacking using ESP8266? There is a full page of apps in the Google Play store dedicated to connecting everyone’s favorite low-cost WiFi module.
We just covered the tip of the iceberg here. What kind of hacking would you use your spare Android phone or one of the low-cost prepaid devices? Let us know in the comments!
Yes, about a year ago, Target offered such a phone for $10, and it was emailed to the local Linux community, and they cleaned it up.
Place it in a frame or bezel, and it can be used as a touch screen display for the project. (Well, it doesn’t have to be in the border to do this, but maybe you don’t want it to "go away")
We should list all ESP8266 apps for Android on http://www.esp8266.com or WIKI
In the United States, many grocery stores still sell for $10. There are 9 dollars and 10 dollars in my area. I bought 2 of them for $10 last year.
If you think about the number of things they can replace now, they are now much cheaper than they are now, which is really, really crazy.
This is useful for amateur radio operators who want to use APRSdroid for APRS to take advantage of the phone's GPS.
I'm not sure how many of these cheap prepaid phones have GPS.
In the past few days, I have seen a full Android prepaid for $15 locally, and I seem to remember that the device I was looking at did not have a GPS. Of course, some cheap prepaid phones do have more hardware features than what I have seen. I also took a look at the prepaid Android phone for about $100, but I don't remember having GPS.
My impression is that during emergency calls (at least in the US), all cell phones need to use GPS.
But this "GPS" may just triangulate the signal tower it receives. Not a real satellite receiver.
You cannot always cover multiple base stations, so GPS is required in the United States.
deraxeman-Although you sound authoritative, I do think you are wrong.
http://forums.majorgeeks.com/showthread.php?t=235811 There is some discussion about this.
GPS chips and antennas are expensive, especially their size.
More specific and useful information on this topic: http://www.pcmag.com/article2/0,2817,2394177,00.asp
"At this time, when you dial 911 from a landline, the operator can easily track your location, but the same service for wireless devices is still in progress. On September 28, the FCC issued an update to its E911 requirements. Some people I think this means that mobile phone manufacturers must make all their devices support GPS by 2018. However, this is not the case."
There must be one for Exceed 2 (I am looking at Google Maps now). I think GPS is built into the cellular chipset, so from the manufacturer's point of view, these phones can get this feature for free (or at most the additional BOM cost of GPS antennas and some passive components).
I think it may still be triangulation. I'm pretty sure I have a mobile phone that uses triangulation to try to provide maps in the now a little distant past.
In addition, things like HTML5 have various "backup" modes for positioning, arranged in order of priority, usually GPS+wifi+triangulation is preferred, then GPS+, etc., and finally just triangulation. At the very least, HTML5 provides a way for developers to determine what method is being used to adjust user expectations.
You are correct more than 2. http://www.androidcentral.com/lg-optimus-exceed-2-now-available-verizon-prepaid-plans
It may have a GPS receiver, but one of the unpleasant features of many mobile phone GPS units is that they pass timing measurements to the satellites on the phone, and pass the results to the "location server" provided by the cellular operator for actual processing. Location calculation. So they can sell you services. It can also provide a slightly faster first repair time, which is a requirement of the FCC.
You can refresh the radio.img again to get rid of the cellular connection.
Newer phones support E-911, and when properly pinged, they respond via SMS with GPS coordinates. Older phones or phones without GPS are triangulated by the cellular tower system instead of the phone. The third way is that you have authorized the use of any installed applications in your location. For example, this is why I hear advertisements from local car dealers when I listen to Pandora... This is a good read: http://pursuitmag.com/locating-mobile-phones-through-pinging-and-triangulation /
Noirwhal, you are wrong. I have worked on cell phone tower electronics for more than 15 years. The GPS device in the tower costs about $75 to buy, while the antenna is only about $50, I believe. One thing that does cost money is having someone like me spent 4 hours putting all the wires in a cramped shelter. But please tell us what do you think is expensive?
GPS is not required by law, nor is it part of every cell phone.
Cell towers are another matter, not what I am referring to.
For a 15-dollar prepaid phone, relying on poor people’s monthly payment to make up for the initial loss, a 10-dollar GPS and a 10x10x2 mm antenna are costly and take up a lot of space.
I have to chip in. It is absolutely absurd to say that smartphones do not have a built-in GPS. I am an Android developer and own nearly 150 smartphones, including more than two. In all of my development process, I have never encountered a mobile phone without a GPS chipset directly built into the Qualcomm SOC. No, this is not a triangulation technique from a cellular tower. Smartphones contain GPS. They all do this. Because I know you will find a way to "debunk" this statement, this is information for other users. Remember my words. 100% of smartphones contain GPS. Usually includes Glonass chipsets from the United States and Russia. Christ, only triangulation tracking is available for mobile phones in the 90s and early 2000s. Yes, another commenter is correct, GPS is also a requirement of e911. Well, at least there is a GPS.
Why do cell towers need GPS locators. They will not move. Use a good GPS receiver to measure once and you are done.
In fact, GPS will drift. Installing a GPS receiver at a known fixed location can map and compensate for drift. The more known fixed data points for this drift, the better.
I'm not sure about GSM and LTE, but the CDMA network (Sprint/Verizon in the US) uses GPS receivers on the tower to synchronize signal timing between cellular sites (https://en.wikipedia.org/wiki/Code_division_multiple_access). Sprint The CDMA femtocell base station provided by Verizon requires GPS to operate, although this may only be to ensure that it can only be used where the operator has obtained its frequency license.
According to this page, it has "GPS and S-GPS".
This is a cool entry. Every time I am in a dollar store, I look at prepaid phones thoughtfully, wondering what I can do with them if I have time.
Is there a good way for android to use these? How would anyone figure out the LCD interface and other information needed to run C directly on these?
After gaining root privileges, these are basically Linux machines running Busybox. Think of it as a router with a touch screen, speakers, buttons, microSD slot, etc. You don’t necessarily need to *use* the Android part of it. If you choose, you can enter the thing via ssh and crack it.
I want to buy one and have a look! Fun weekend project.
What's really interesting is when you replace the kernel with your own. Unfortunately, Secure Boot does not allow this, you must use the provided kernel.
Have you never heard of Androidthermostat? (http://androidthermostat.com/) I have one that runs on such a cheap phone.
It’s a coincidence, I just replaced my raspberry pi kali box with nexus 5... it’s a ton of cleaner, and it’s much lower-key
crazy. I'm very new to all of this, so I'm a bit lost. Do you know how to run Kali on Nexus?
Philip, are you running Kali or Nethunter? It's the same on the surface.
OF, take a look at http://www.nethunter.com/
Finally I have a chance to respond to this, yes, sorry, I forgot to specify the nethunter accurately, almost all the custom scripts I made are directly moved from my pi to nexus 5 and run perfectly
It can also be used as a cheap media device, used to connect to stereo or TV, used in Pandora and other devices.
This is a bit ethically problematic, a bit like software unlocking your range to get a better model for free. In terms of technology, this will be a viable alternative to stick computers. The motherboard in a smartphone is very small.
Yes, I agree that this is morally indisputable. We have had similar flame wars on HaD before. Do you want to start another one?
This is *not* morally problematic.
not at all. Not at all. Nowhere, no matter what, you have to agree to anything before you can use the phone. You buy a mobile phone. The company intends to price it at a low point in order to attract people to come to serve. For them, the loss is worth it.
Unfortunately, you may be incorrect. Companies can specify various "terms"-including the use of "their" hardware.
Recent history has shown this to us.
They can try and decide on anything they want, but unless you sign something before buying, they have absolutely nothing to do
It depends on your purpose. If you design one of them as a product, even if it is a low-cost product, you may find yourself with some annoying letters.
In addition, it is not particularly important what the legal or ethical issues are-if you try to do business, if these big companies want to stop you, you will be stopped.
Continue to say "but that is for commercial use"-I agree, but what you said is absolute-they are not correct.
Low cost means small batches. Oops!
How did we go from stealing low-cost phones for personal use to stealing the same mobile phones in batches for commercial activities?
Savanah-From the device manufacturer's point of view, there is no difference. They just won’t find your personal project, because the end user’s commercial product may eventually be discovered by the manufacturer of the integrated phone.
When I bought it, it was no longer their hardware, even if they sold it to me at a loss. Sometimes supermarkets also offer low-price concessions, hoping to let people enter their stores to buy more expensive things. But they cannot guarantee that people will do this. :-) As long as I don't need to sign anything, they can only hope for their business model. Even if you sign something, you usually don’t sign the minimum number of hours to use it on the network.
Nonsense, they want to sell it for $10, but you want to buy it for $10. Of course, they will assume what you will do with it. But you promise nothing. This is a numbers game, and as long as most people associate them with a contract, they can afford to lose some extra phone calls.
I'm just angry that the UK does not do this. Most British mobile phones are no longer network locked, so the only way to spend a few cents on a mobile phone is to sign a contract. For poor people who want an iPhone like all other poor friends, this is usually a stupid punishment, because for some reason it's cool to have an overpriced phone.
I beg the kind Americans to send me a phone for $10, but they don’t work in the UK anyway, do they? Different systems and frequencies.
Spend £90 on the cheapest 4G Android system I can find...
However, if you don't use it as a phone, some kind Americans can send you one. GPS and all other functions still work. In addition, if you really need telephone service, I think you can still use the GSM frequency band. This works in the UK, right?
This is not GSM, it is just CDMA. The two US CDMA operators are transitioning to LTE, and there are indeed some prepaid phones that can run on these two networks and use SIM cards on LTE cells. But these prepaid phones are actually useless on the other two GSM-based operators, because they either do not have GSM/LTE support or the SIM card lock is tightened.
This lock-in is why they sell these products at such a cheap price without obvious additional conditions. If you look at GSM-based operators, prepaid services of the same model are much more expensive.
Even if there is no mobile connection, its hardware prices are very favorable. I really hope that the UK will also have such a deal, which will make home automation and other more affordable.
Greenaum, at the beginning of this article, I explained the meaning, you can use what is designed as a "phone" for countless other purposes. Therefore, I don't understand why it is not as useful anywhere as it is in the United States. Via wifi or bluetooth, it can still be used with ad-supported software for free texting and cheap or free voice.
This article is about using the device for all devices except mobile phones, so there is no difference. And, as Mark said above, if you have to use it as a phone, then Europe should be able to use the GSM frequency band.
Yes, I changed the subject halfway and complained about the price of mobile phones here. I think if it is a good idea to import a $10 cell phone from the United States, someone will do it.
At the same time, as people have mentioned, if you only want a $10 computer, it is worth buying a few if you are going on vacation. Although there may be problems with import taxes, please bring your family and pretend that they each have 2 phones.
If you pay for shipping, I will send you a pair (I think this is the bad part)
The GSM frequency band is available in Europe, but the frequency (900/1800MHz) is different from the US (800/1900MHz)
You can still buy robots from dx.com or aliexpress for less than $50. They should work normally on the UK network.
Now I want to know if I can find these 10 dollar phones in Canada...
I don't see any problem at all. With scope, you might "pirate" code to run these functions, but IMHO, even this is really suspicious. You pay for this device and then use it.
People used to think of coffee machines.
what else? I bought a device-I can use or destroy it, or replace the CPU, if I want. What did I do with my SAECO, because after-sales replacement has more functions.
Say it again: I bought equipment, not services or contracts.
Fortunately, my coffee machine can accept coffee of any brand, whether it is a Nestlé or a fair trade product, cheap or expensive, good or bad.
There is one in every crowd, isn't it?
How is this different from buying Keurig and using refillable pods, or buying Amazon Dash and reusing it?
It's really different. These three things are completely fine. If the company does not want this use, then it should sell these things at actual prices. I buy it, I own it, and I don't owe anyone anything.
More than 2 http://amzn.to/1FzNwSd
Rotate 2 http://amzn.to/1EQrU9n
These two can definitely be rooted?
Is there a list somewhere you know that describes prepaid phones and their hackability? thanks.
I also want such a list, but I don't know. You can decline the update when you first start the device and try some of the suggested methods in this article. Even without root, you can still use them to do many useful things. For example, I like to install webcam servers from the Play Store and use them as cheap wifi webcams for $20.
perch is an application that can do this
If you plan to root it, I will be wary of any Verizon phones. They are notorious for forcing manufacturers to permanently lock the bootloader on their old phones. Some Sprint phones are also difficult to root, and some can only be soft rooted (root is deleted after restarting). The best option in the $20 range is a GSM SIM-based device.
If you want a more powerful phone that is truly hackable, consider using one of the older Nexus devices. Today, you can buy the Nexus 4 for much less than $100, and Google still offers ROMs dating back to 4.2.2. It is designed to be rooted and used as a developer device, and it can yield to your wishes effortlessly. If you feel particularly abused, you can also run other operating systems on it, such as Ubuntu Touch and Firefox OS.
For more hackability (and street credibility), look for Nokia N900. It is very close to the "pure Linux" phone you get (Maemo is just a Linux with Nokia GUI, it even has a packaging system similar to apt), and its hardware is not too big for any non-mobile phone project Shabby-related. Be prepared to pay a premium; the Neo900 project has pushed the price of second-hand equipment up to the stratosphere.
This is also my problem. I was burned by the "cheap" Moto G; I didn't do enough research, so I didn't realize that most of them can unlock the bootloader (cooperation with Motorola, because I remember Motorola's implementation is actually very reliable) But the "XT1028" variant of prepaid Verizon is not supported to be unlocked by Motorola's bootloader; and since most other models can unlock the bootloader, all concerns about rooting/custom ROM are "unlock the bootloader first, Then refresh the custom recovery to make necessary modifications to the stock ROM or refresh the third-party ROM"
As an "Android ipod touch" type device, it is still very cost-effective and supports Play Store and side-loading applications; but it is obviously not as useful as an unlockable bootloader.
Watch out for Motorola in general. I bought an "unlocked" Moto G retail store with a locked bootloader. Moto flatly refused to unlock it without giving any explanation. The "unlocking" process includes entering the unique code of the device in the form on their website, allowing you to click to agree that your warranty is now invalid (regardless of whether you continue to unlock), bind to your unique code, and then respond with the unlock code or tell you Your device is "not eligible" (call technical support to find out why your time is wasted). Fortunately, I persuaded the seller to "unlock" the bootloader in the ad and purchased Nexus instead. The bullet dodged and learned a lesson.
Wuff-It has gone up by $5 since I ordered one last week.
One problem I encountered when trying to control with a mobile phone or tablet is that they usually do not charge and support USB OTG at the same time.
In one case, I used my own power supply to replace the battery itself, and in another case, I gave up using my $70 or so Windows 8.1 tablet as a 3D printer controller.
I want to know if it is feasible to break into the USB OTG cable and connect a 5 VDC power supply, and use one or two diodes to isolate the PS... Haven't tried it yet.
On at least one device, I tried it completely, with or without diodes. There are no dice. It does allow you to power external devices without draining the battery. This is what I tried on a cheap 7-inch Windows tablet and HTG Thunderbolt (very good phone)
Beware of any cables/adapters that claim to provide both USB OTG host and USB charging.
I saw that there is a single model of mobile phone that can be charged and connected to USB, but it requires the hardware module in the phone. I think this is a relationship 6.
My nexus 5 will charge and use my OTG alfa card no problem, it will not change the icon to the charging icon, but it definitely does
Wow... I haven't done enough testing to know if the device is actually charging-I continue to click on the icon.
If this is the case, then either I have a magical phone, or I am dreaming/have hallucinations, because my Galaxy Note 2 works very well as a USB host and can be charged simultaneously through this USB-OTG hub.
http://www.ebay.com/itm/Micro-USB-OTG-Hub-Host-Adapter-Cable-For-Cellphone-S3-S4-S5-Note-2-3-High-Q-/291348805773?var =&hash=item43d5bdf88d
When I tried these cables, these cables failed for me-but they might work on some phones.
When I tried to make it work, I did an extensive search on Google and learned that many people have tried using OTG charging\host cables and failed—not just me.
I can’t give Noirwhal a reply (I guess it’s nested too deep) but on the cable I got, it has a slider switch with "OTG" and "Charge" written on it. On some models of mobile phones, OTG is required to actually charge the phone during use (Note 3 is the case), while on other models, you set it to the “charging” setting (I think in this setting, you Then it cannot be used as an OTG.) The list I linked here says "◦The switch in the "charging" position: The Micro USB port can charge mobile phones or tablets, and the OTG function is available. ◦The switch in the "OTG" position: Micro USB I can’t charge a mobile phone or tablet, and the OTG function is invalid.” But this is a bit contradictory (that is, you can charge and use OTG in one location, and you can do it in another location.)
Basically, your mileage may vary depending on the phone you own.
A few years ago there were Motorola series phones that supported (overpriced) Lapdock. (I have bionics) Those will charge and provide USB host at the same time. If you are not doing this on one of the laptops, you have to perform some tricks to make it work, but...
No OTG is required. These are two options (#2 is cleaner):
(1) Determine how you want to communicate with your device (roughly speaking, via Hangout messages on wifi) and set the phone to vibrate in different patterns/durations in response to specific messages (for example, using Tasker). Replace the mobile phone's vibration motor with a small circuit to distinguish the modes and switch one (or more) of the multiple loads accordingly. Depending on the size of the load, the number of conditions, and isolation needs (you can use some optocouplers and relays if needed), this can be done with a few passive components and transistors, or you can skip to an attiny if you want.
(2) Or, in each case, let the phone play a simple sound (for example, sine waves of different frequencies) to the headphone jack and connect your circuit to that sound. This will be easier to implement, can be tested on your desktop/laptop/phone first, and can be applied to many different projects, independent of the platform.
Hope it helps! I don't have 25 dollars to throw right now, but I might go next time I see a 10 dollars.
Cool solution, but I think that for most purposes, full USB support is preferable.
Disassembling the phone and finding an additional USB host port, built-in RS232 IO, etc. will be my first choice.
fair enough. I (falsely) assume that anyone who complains about the lack of OTG will lack the knowledge/interest/motivate to go so far. Glad to hear other news.
If all else fails, you can use a dedicated lithium battery charger chip to hang directly on the battery terminal at any time.
Moto E LTE for verizon can be unlocked for $35 (although you have to play some adb games to convince it to accept other simulation games) and has USB OTG
I *like* buying prepaid Android phones for embedded related stuff... However, the downside of these low-key devices is that they often come with a locked bootloader (if the development community does not have one, you may have to figure out how to bypass yourself Not active enough for that device) This may or may not be bad in your particular situation, and if you want to run full GNU/Linux user space (instead of Acore/Linux) in a memory-corrupted chroot jail, Many drivers required to start the basic usable GNU/Linux system are not available (that is, vendor drivers are closed source, graphics/audio drivers are only designed to be used with GraphicsFlinger/AudioFlinger), so you may need to create The information collected in the provided driver blob...
Another idea of communicating from cheap smartphones. https://hackaday.io/project/4196-2wire-i2c-from-blocks-of-light-on-an-lcd-screen
So, I put the same thing on the stack page...
https://hackaday.io/page/1112-idea-make-an-android-rom-which-turns-it-into-an-awesome-dev-board
By the way, I still have to read the entire article.
Why not also buy an iPod first generation? The first generation ipod uses arm cpu
In the trash can, there are free motors, printers and other electronic products. On Ebay, buy military-grade equipment for the price of a meal. In the mail, free samples with cutting-edge ICs are provided. In the corner store, a $10 pocket computer.
Yes, geeks are spoiled in our time!
How to use arduino nano as a GPIO board via USB-OTG?
How to use Arduino Nano v3 as GPIO device via USB-OTG?
For $10 each, you don’t even need telephone service to communicate. Just Wifi point-to-point (or tethering and portable hotspot), each phone can talk to each other! But it's only nearby, so it's more like a walkie-talkie than a real phone.
Log in to your home wifi and use Skype like VoIP!
I want to know how effective they are as wifi repeaters. It can be done with better signals in my new shed.
It looks like it may be an ideal replacement for mechanical clocks, timers and component controls on old General Electric P7 ovens and stoves. Need to assemble a power supply to replace the battery. No GPS or phone radio is required, so a customized Android version can eliminate this support.
Keep WiFi so the stove can become a home media server and display recipes and cooking videos.
I have 5 Optimus Exceed 2 phones. Make a great wifi camera...I have a chicken coop camera, a back door camera, and a front door camera. You can put Google Hangouts Dialer on them and get a toll-free number and make and receive calls for free...long distance calls...use wifi connection. GPS is working properly. They have 4GB SD installed. Bought a 3.75 box with stand and free shipping for them on eBay. The wifi range on these is great.
Hey Bobfeg-what links would you recommend to use to handle these phones?
"Work"? All they did was install them and install some camera apps, they were just wifi cameras, so they sounded like stock firmware business when guessing. Please correct me if there are any errors!
ya It's like a $300 shapeoko, now it's $1,000 plus a shipping cost of $250.
Unfortunately, I'm not sure we don't have such a deal in Canada. The minimum prepaid phone I found at Best Buy is about 70 Canadian dollars, which is pretty good. This is because Huawei Ascend Y330 and Towelroot and other root software can't really work.
This technology application seems to be very similar to the sensation of the 12-dollar gonkai and MediaTek chipsets. I reluctantly admit that this is cool. If you only need wifi, gsm and bluetooth capable devices.
You can very well use the phone acting as a repeater to run an extended wifi network.
The problem I have been encountering when using these types of cheap mobile devices is how do we break them down and decompose them. Failure is not a big problem, because you can find disassembly through ifixit.com.
Break through the ARM chip? This is the most terrifying problem. Using the ARM big.Little instruction set, we can access 64-bit computing. And began to experiment with machine learning, genetic algorithm and HMP, the cost of which is about 1/10 of ODROID-XU4.
Then another brick wall we encountered was whether the ARM chip has 200 and 400 series Mali GPUs, so the lima linux driver will be reliable, or the Snapdragon with Adreno GPU 410 series can use the freedreno linux driver. Ergo compresses the functions of OpenCL. (Or hope to utilize both CPU and GPU cores through the Khronos-SPIR project.)
Just a reminder; if one plans to expand in the past, it is just an article suggestion. Check khronos.org, phonearena.com and search xda-developers.com extensively
Things about Perk TV are interesting. It's a bit like Bitcoin mining, but using cheap smartphones.
Any tips on where you can buy such a cheap cell phone in Europe?
I have an old Android device with a charger and want to reuse it for a task: every minute I sense if an LED light in my house is turned on, and then notify me via email.
I asked the think tank in the comments section of hackaday: Is there any application or other solution that can do this as easily as possible? Any OpenCV style application with ready-made functions for sensing and notification tasks? It needs to work when the surrounding room is dark or the lights are on. I can put the phone in a fixed position close to the LED.
One option is to look for a phone that has a mini HDMI integrated in the micro USB charging port (there are many). With an HDMI display and Bluetooth keyboard and mouse, you have a super cheap and powerful terminal that can be extended through applications to meet almost any type of desktop computing needs.
Orrrrr... You can buy an Android HDMI dongle for about $20. I don’t know how many cheap phones have HDMI, at least it seems to be a non-basic feature.
These phones are too rubbish, I have a VZW LG, maybe the one in the picture, no USB OTG, and no direct Wi-Fi connection. I rooted it, but it's harder than better phones, I don't think cyanogenmod will work, anyway it didn't fix USB OTG as I wanted. Then I tried to make it just a car audio player, it didn't want to play the headphone jack. I didn't dig too deep, but it might require proprietary headphones? I decided to change to a BT cassette tape.
I think you can install a SIP client application for $20 and own an IP phone.
But I finally bought the HTC Wish 510 at a discount of $50 from CL, and the savings were not only worsening differences. Looking for a "bad ESN" phone on eBay, the last time I checked, I hoped that the 510 would sell for $40.
Freedompop provides Android phones as low as $30, and after the first month, sprint provides 500MB of data for free. (Plus some free voip calls/texts.) You have to disable the automatic renewal of the "premium" plan, which is hidden in their menu and has annoying warnings.
Wireless security camera. Beat me.
Freedompop now offers LG Volt for $50. I bought one last week. It is a very powerful phone with a 3000 mAh battery. I have root permissions and run CM 12.1, and still use 4G LTE on the Sprint network-via Freedompop. You do need to opt out of all their premium services-and disable recharge, but you still get free unlimited calls\texts and 500 mb of data per month. One caveat is that Freedompop phones and text use data connections-so VOIP.
Link: https://www.freedompop.com/offer/lgvoltpromo
Hmm.. I am playing with arduino and android.. Serial communication via USB is possible.. This makes me hope..
But I can't get OTG mode + charging mode at the same time.. That's too bad.. Do we have to replace the battery with a power supply? That's too bad.. I am testing the 124k resistor (and 100k and 24k) between the micro USB pin 4 and GND to start the "dual mode".. Cannot be used with my moto g 2013 and cm 12.1 I am working Looking for a kernel mod.. but found nothing.. Anyone else?
The biggest problem with these phones is the GARBAGE software support they get. Looking forward to the old version of Android, lack of OTG, out-of-the-box basic functions may not work properly, and non-existent ROM, because all developers know that mobile phones are bad.
If anyone knows a cheap phone with active ROM support, please let us know.
Assuming long-term use (that is, longer than the normal use time of the battery), how to deal with power problems? Presumably, would it be considered unsafe to keep the phone plugged in (in charging mode)?
These phones have a smart charging system that reduces the power to a maintenance level sufficient to maintain battery power. Some larger mobile phones and tablet computers need a charger that can output 2 amps or higher, and use the special trick of the data cable to tell the phone to plug in a special high-power charger.
Simply short the data cables together, and on the side "facing" the device, you should tell the phone that it can draw up to 1 ampere of current. This is not enough to keep most tablets and some larger phones charged while in use.
There are 3rd party smart charging chips that will detect which device they are connected to (especially Apple and Samsung) and configure themselves accordingly so that the device gets the maximum power.
I would love to see Adafruit, Sparkfun or some other companies selling cheap universal mobile phone/tablet chargers. The special chargers that Samsung, Apple and other companies want are ridiculously expensive-this is why there are thousands of cheap and generally unsafe counterfeit products that usually only provide up to 500 mAh when they are working properly Or 1 ampere.
If they don't want the counterfeit, they can stop asking the customer for a replacement charger.
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