Not sure if I'd trust
Amp'd service. They're not a "true" carrier, as in they don't have their own network / infrastructure, but piggyback off the towers of other people's (VZW's EVDO network). Their target audience are the MTV-savvy 18-35 demographic, so they focus is on playing viral videos and MP3's on your phone and music ringtones.
http://en.wikipedia.org/wiki/Amp'd_Mobile