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[–] ignacious_riley 0 points 3 points (+3|-0) ago 

Raspberry pi with a battery, gsm module, microphone, speaker, and touch screen. You'll need to do some very basic programming to set up an interface with the gsm module, but other than that, you pretty much slap it all together like legos.

It'll look pretty retarded, but that's (probably) under $200 of parts for a linux based DIY cell phone.