Communications equipment needs to be designed to support QoS (quality of service) especially when the networking environment is sub-optimal. iPhone 4 seems exhibit dropping more signal in the frindge area when not gripped as Steve suggested. A device shouldn't degradate signal strenth in this case, regardless how you grip the phone. It's not only the signal strenth problem, but it also causes the battery inside the phone drain faster while you are on the phone, since the tower will ask your device to increase the transmission power when it senses your weak phone signal. It is obviously a serious design flaw. Apple should admit it and take action on it. So far, its atittude has been irresponsible, not like Apple. I already got the phone for myself and was about to purchase another for my son's 3GS replacement, but I am changing my mind.
-K
-K