Open source phone "Gongkai" for $ 12

For the price of a couple of cups of coffee, you get a full-fledged phone with a two-color OLED screen, Bluetooth and the ability to play MP3 music. All this is in a transparent green case.

As bloggers write, the estimated cost of a Gongkai phone is about $ 10, that is, it is also sold with a good margin of 20%. The package includes a charger, USB cable and a protective silicone case.

It is interesting that in the assembly of the device no screws or screws are used, parts of the case are simply latched using a mechanism. Fastening internal components is also likely to reduce the cost of production - the screen, a lithium-polymer battery and other parts are simply soldered to the motherboard.
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Also interesting is the comparison with the 3rd generation Arduino Uno:

Spec	This phone	Arduino uno
Price	$ 12	~ $ 20
CPU speed	260 MHz, 32-bit	16 MHz, 8-bit
Ram	8MiB	2.5kiB
Interfaces	USB, microSD, SIM	USB
Wireless	Quadband GSM, Bluetooth	-
Power	Li-Poly battery, includes adapter	External, no adapter
Display	Two-color OLED	-

UPD by BarsMonster : “this is open source in Chinese”