I wish there were such a phone. As far as I can tell, no major phone manufacturer provides either the source for their firmware or the specs that you would need to write your own. I think your best bet would be to take a look at open moko: http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware
The freerunner is a smartphone that runs at about 400$ Since the full hardware spec is available here: http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware I think it may be possible to omit many of the parts that drive up the price, and make a derivative design that is simpler and cheaper. eg, drop the wifi, gps, bluetooth, usb, and accelerometer. However, I am not a computer engineer, so I'm not sure how difficult that would be, or if it would even be cheaper.
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该领域最先进的项目是OsmocomBB。
诚然，找到合适的硬件并不容易，但并非不可能。
The most advanced project in this field is OsmocomBB.
Granted, finding the proper hardware is not easy, though not impossible.
我希望有这样一部手机。据我所知，没有一家主要的手机制造商提供其固件的源代码或您需要编写自己的规格。
我认为你最好的选择是看一下 open moko： http://wiki.openmoko.org /wiki/Neo_FreeRunner_GTA02_Hardware
freerunner 是一款运行价格约为 400 美元的智能手机
由于完整的硬件规格可以在这里找到：http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware
我认为也许可以省略许多推高价格的部件，并做出更简单、更便宜的衍生设计。
例如，删除 wifi、gps、蓝牙、usb 和加速计。
然而，我不是计算机工程师，所以我不确定这有多困难，或者是否会更便宜。
参考：自定义手机固件
I wish there were such a phone. As far as I can tell, no major phone manufacturer provides either the source for their firmware or the specs that you would need to write your own.
I think your best bet would be to take a look at open moko: http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware
The freerunner is a smartphone that runs at about 400$
Since the full hardware spec is available here: http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware
I think it may be possible to omit many of the parts that drive up the price, and make a derivative design that is simpler and cheaper.
eg, drop the wifi, gps, bluetooth, usb, and accelerometer.
However, I am not a computer engineer, so I'm not sure how difficult that would be, or if it would even be cheaper.
ref: Custom Phone Firmware
我（认为）为您提供一些有用的东西：motorola on sourcefroge
或 进入操作系统页面
I (think) get something intersanting for you: motorola on sourcefroge
or go to the page of the os