The battery stamina does seem quite bad. I didn't make it through the 1st day. I did notice that if I had no signal for several hours the battery would die a lot faster. Also sometimes (rarely) when I connect the phone to the USB port on my Win7 PC it does not enter charging mode. One morning I had a almost dead phone. My SIM card is 13 years old and says omnipoint on it which became voicestreamn and then t-mobile.