What were your reasons? My iPhone 4 has these issues and please advise me if it is good enough to exchange it with warranty. 1. Proximity issue. This happens 1 out of 20 calls I make. But, it is still annoying. I heard it only affects small users, so I hope I get a replacement phone. 2. During cover flow, my phone doesn't show album arts sometimes. 3. Battery is not as great as others get. I get 3-4 hours of usage, but I don't use it that much. 4. My signal is not as great as what I used to get on my Blackberry 9700 or iPhone 3G. I understand about Antenna issue, but I have a case on it. I think my iPhone is having trouble connecting towers? I meant to put case for it anyway, but do you think apple will replace it? Also, do they give you refurbished ones or new ones? What kind of questions they ask for it?