PiPhone - DIY Cellphone based on Raspberry Pi and Adafruit PiTFT by David Hunt
GUI adapted from code by PaintYourDragon (Phil B) for Adafruit Industries
Read more about this project at Dave's Blog
You must have gone through the Adafruit PiTFT setup instructions.
git clone https://github.com/climberhunt/PiPhone.git
cd PiPhone sudo python piphone.py
Full details at: Dave's Blog
If you would like to donate to the PiPhone project to help support future projects, you can do so via PayPal