3G has stopped working on my launch day iPhone 4. Edge works sometimes. The sim card works fine in my 3GS. Anyone heard of this problem before? Done a full restore with no joy(and another problem, iTunes wiped my iPhone 4 back up when I just choose to call my restore iPhone 'iPhone' to test it out - is my back up lost forever? ) I'm assuming if I take it back to the Apple store at the weekend, if they have stock, they'll have to give me a brand new replacement? It's just over a week old, so I'd want one in a sealed box! Anyone else hear of this issue?