So I sold my 32GB iPhone 4 on eBay on Saturday running the iOS 5 GM. I went into "Settings > General > Reset > Erase All Content and Settings" and removed the SIM card. It was on the initial "iPhone" setup screen when I turned it off and put it in the box. Now, I can go into iCloud and my phone shows up at the location where I shipped it to. I can remote wipe, lock and everything. Should I be concerned at all? lol I don't have a clue how this happened.