Meet the WiPhone: a VoIP mobile phone designed with hackers in mind. It can be modified and repurposed for all kinds of fun projects. It can be disassembled in a minute with 6 screws. The firmware can also be easily modified.
The device is based on an Arduino development platform. It has a 2.4″ screen, 700mAh battery that lasts for 8 hours, and supports MicroPython. It has a 20-pin programmable header on its back.