Okay I use an iPhone 4S. It is jailbroken but I'm not sure that has anything to do with the problem. For the past couple of weeks I've noticed absolutely horrible reception. Yesterday I hit rock bottom as pretty much all day it either had the AT&T logo show up with 0 bars or it had 1 bar of service. It would go to 5 bars for about 30 seconds and drop right back to 0 or 1. My question is, do you think this is a problem with the service antenna, and has anybody else had this problem? Today it seems to be behaving a lot better but I'm still wondering if I should get the antenna replaced. There is an iPhone repair place not far from me.