I'm sorry but I have to say I'm very disappointed with the call performance of the iPhone 4. For crying out loud, can they just focus on call quality/reliability for one generation? I have LESS signal indoors than I had before...we are told we have to hold the phone a particular way or to buy a case to get the best signal performance....and the proximity feature was adjusted such that I'm always accidentally cutting off calls or hitting mute while talking. It's simply ridiculous that on a phone as sophisticated as this one that doing basic telephone calls is the biggest hassle. Common already.