I've had my iphone 4 now for about a week and like many have suffered from reception issues related to bridging the lower left side antennas on the phone. What's very odd however is that so far I can only replicate the problem at my house. Here's the situation: At Home: I'm literally 2 blocks away from what I believe are the ATT cell towers for our area. I have full bars almost all the time with both the iphone 4 and the 3gs I still have. On the iphone 4 I can immediately drop the signal down to 1 bar by just holding like I normally would. If I deliberately bridge the antenna in the lower left I can get the "no service" indicator within a few seconds. This is 100% repeatable all the time and it's a big issue because I can accidentally drop a call if I'm not paying attention to my hand position. At Work: I'm in an office complex with a cell tower about 1/4 mile my window. I get full bars all the time. However unlike at home, no matter what I do I can't get the phone to drop even one tick of signal. Even deliberately trying to bridge the antenna does nothing. I realize the signal bars are just an approximation of the signal so I may in fact get better reception at work, but I find it odd that the bridging issues are completely gone in one location, and 100% repeatable when connected to a different tower. Is it possible that some cell towers cause this problem and others don't?