A software engineer David Hunt from Limerick in Ireland has built a fully functioning smartphone based on Raspberry Pi. The PiPhone is built from off-the-shelf kit, so there’s no soldering required, and no complicated electronics work. The total cost of all components amounted to only $158 (£94), and included an Adafruit touchscreen interface, a LiPo battery and a Sim 900 GSM/ GPRS module.
Developer David Hunt turned a Raspberry Pi Model B computer that costs $40 into a handset by paying an extra $120 on other components, including 320 x 420 touchscreen, a 2,500 mAh battery and a SIM900 module.
We can see the main a Sim900 GSM/GPRS module allowing us to send standard AT commands to it to make calls, hang up, send texts, data etc. At the bottom we see the white PCB, SIM Card, which allows the module to associate with my local GSM network. The PiPhone is able to make and receive phone calls using a regular SIM card, however its capabilities do not go beyond these basic functions at present.
“It’s more of a proof of concept to see what could be done with a relatively small form factor with off-the-shelf (cheap) components,” said Hunt in a blog post. “I don’t expect everyone to be rushing out to build this one, but I had great fun in doing it.”
you can refer to: http://www.davidhunt.ie/piphone-a-raspberry-pi-based-smartphone/
“It’s smaller than many of the phones I’ve owned, and it’s cheaper than the phone that’s currently in my pocket,” said Liz Upton from the Raspberry Pi Foundation praising the device. “The PiPhone is built entirely from off-the-shelf kit, so there’s no soldering required, and no fiddly electronics work.”