Ok, so I sold the iPhone 4 to a friend, but had done the iOS5 update. I removed all my info.. So here it goes. The new owner of my old phone got there service hooked up with their own number, but somehow both the old and new phones receive the same text messages. So for example, the girlfriend sends me a text, (which I get), but the only problem is a few minutes later we are both getting the text, "who is this", and come to find out it's the new owner of my old phone receiving the text also... Thoughts? I'm thinking it's that AT&T has the old SIM connected to my account still.. .I hope this makes sense.... Someone help!