Recently I've been loosing signal everywhere I go, so I decided to go to a near by AT&T store, spoke to a rep he took my sim card out & guess what... My sim was totally fried. The rep ask me how did I manage to fry my sim. I told him that I had no clue. Anyways..... If your having problems with 3g or full bars why don't you check your sim. Look to see if there's any damage to it, if so get a new sim, you won't have problems anymore. I have 3g and full bars everywhere I go.