New to Sprint and Android here. Just left AT&T / iPhone 3GS for the EVO 3D. Love the phone. Battery lasts over 8 hours here if I have bluetooth/4G/wifi off. Philly area here, 4G is here but it seems to be spotty, so I keep it off most of the time as it seems to be a real drain on the battery. 3G seems to be fine - much better for data than AT&T's crappy data. I turn on the bluetooth when I'm driving to use with my car's built in bluetooth. And I use wifi when I'm home.