A cellphone with only with the features you need. That's the idea behind Bug Labs, the DIY cell phone company.
The Bug Labs phone is made of modules, which become the building blocks of your cell phone. The basic module is a Linux computer with 128MB of RAM with WiFi, USB and ethernet. Frankly it's not as sleek-looking as most cellphones on the market and it can get rather bulky as you add on more features, but having a hand in the manufacturing process of a cellphone might be fun and worth the brick-like bulge in your pocket.