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This question is about low end mobile phones which cost around $50 to $100, unlike Smart Phones like iPhone or the ones that support Android.
Nokia 1280, 1800 are some examples.
I want to customize the basic features such as Contacts, SMS in such a phone. So I either want a open source code of its firmware that is compatible with one or more of such phones, or I would like to know of a vendor who could sell a cell phone within this cost range along with the source code of the firmware?
Do these phones have any OS running in them? Or just a single threaded firmware program?
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GrapheneOS is a privacy and security focused mobile OS with Android app compatibility developed as a non-profit open source project. It's focused on the research and development of privacy and security technology including substantial improvements to sandboxing, exploit mitigations and the permission model.
The Android operating system is one of the most popular open-source platforms in the mobile operating system market.
Firmware updates allow bug fixes, new functionality and security updates to be applied to a device. As such, they are an essential element of keeping devices up to date. You will need to consider how your organisation will deploy and manage firmware updates.
According to one definition, firmware in Android serves as a bridge between the hardware and the operating system. The firmware on devices only contains the necessary instructions for the hardware to work with the operating system installed on the device.
The most advanced project in this field is OsmocomBB.
Granted, finding the proper hardware is not easy, though not impossible.
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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
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