I bought a used 3 GS- in pretty good shape. It worked fine for about a month or so, but now I have a real power suck on the battery. I have done all the normal things to help- Location services is off, Wifi off, 3G off, bluetooth is on, LCD is pretty dim and in auto.... and yet when I drove my daughter to school this morning, I returned home and had 83% battery. That was a 45 minute drive. No phone calls, no nothing, just sitting in my pocket. I have not added too many apps, and those that I have, I have deleted, to see if maybe one of them was the pwer suck. The phone gets REALLY warm- not hot, but very warm. Any ideas what else I can try?