Zerophone

if you told me when i was a teenager that i'd be able to build my own mobile phone for around $50 i would have said you were crazy but that is where we are today, using off the shelf components and a bit of open source software and a bit of spare time and effort, you too could own something like this and even build your own 3d printed box around it -- pretty neat.

ZeroPhone is an open source, Linux-powered, $50 smartphone. It has no carrier locks, bloated apps, or data mining, and it doesn’t depend on big companies - instead, its open source hardware and software give you as much control over your phone as possible