It Only Costs $400 to Build Your Own Cell Phone Network

The first step is to download Brandon Creighton’s code, which you can find on GitHub. Then you’ll need to spend about $400 to build a software-defined radio to handle cellphone tower duties. With a lot of tinkering and some telecom know-how you should—conceivably—be able to get your own 1G network up and running. – Alex Cranz, Gizmodo