I just got this iPhone used from a buddy who upgraded the the iPhone 4. He had no issues before this. It sat for a few months before he sent it to me. I unlocked it as i live in Canada and went to use it for the first day and within a few text messages it was at 77% battery. I went to bed and by morning it was dead. it lasts about 2 hrs of standby. I just looked at my data usage, and noticed it is through the roof. I know I didn't use it all, so wondering if there is something running in the background. I already have PrivaCY installed and, to be honest am not sure what to do with it but it is on to my knowledge. Any help will be appreciated.