Hackaday blog: There are several open source phones out there these days, but all of them have a downside. Hard to obtain parts, hard to solder, or difficult programming systems abound. [Arsenijs] is looking to change all that with ZeroPhone. ZeroPhone is based upon the popular Raspberry Pi Zero. The $5 price tag of the CPU module means that you can build this entire phone for around $50 USD.
- Raspberry Pi Zero in a PCB sandwich
- No proprietary connectors, hard-to-get parts or chips that are tricky to solder
- All the specifications for making this phone yourself will be available
- Python as the main language for developing apps (aiming to add other languages later)
- UI toolkit making development quicker and easier
- Numeric keypad, 1.3" 128×64 monochrome OLED screen (with screen header supporting other types of screens)
- 2G modem for phone functions, can be replaced with a 3G modem
- WiFi (using an ESP8266), HDMI and audio outputs, a free USB host port
- GPIO expansion headers for customization
- RGB LED and vibromotor – for notifications
- Tons of Pi Zero-related hacks that were discovered along the way, that I'll share with you as the project goes =)
Details on the Novaspirit website.