I am building a rover, Need advice for small phone.

[Todd Allan]

I am in a rocket competition. My contribution is the autonomous rover that will be stowed and released. After destroying multiple phones,(trying to extend the camera) we are trying something new. In the front of our rover we want to use a cell phone to provide live feed. Smaller the better, from wheel to wheel we have 4.7". So we need a phone that can use Skype and is less than 4.5" in length. Preferably cheap, doesn't have to be fancy or new. Any suggestions? furthermore, it looks like it may have to be on Verizon's network. Huntsville Alabama near the NASA base is where we need coverage, It will travel roughly a mile high. Any advice or suggestions is appreciated.