How is this thing on battery? It says 3.5 talk time and 200 idle. Some lady at the metro store told me she played with it for 9 hours (pandora, wi-fi, apps) before it turned off. I didn't believe her cause she was probably just trying to sell me the phone. I basically want you guys to tell me how much it lasts you or someone you know (describe how long it lasts and what you do on it).