I seem to have antenna issues when the phone is in my pocket (generally jeans). When I take the phone out of my pocket I often only have 2 or 3 bars at first and then it goes up to the full 5 shortly thereafter. It mainly seems to happen when I'm sitting down, such as in my car. It also seems to happen if I'm in my car and put the phone under my crotch area. It could be the body heat, or some other reason, I'm not really sure. Anyone else have this problem? I'll be getting a bumper soon, hopefully.