Just a quick question if anyone has sold an iPhone before. I dropped mine (iPhone 4) and the front cracked and decided to pay the ETF with AT&T and put it up for sale. So as it stands, the contract is cancelled and I have reset the phone to factory defaults and erased all data. When I sell this, is there any issue with leaving the SIM card in? I wouldn't think so, but just want to make sure I'm not exposing myself to any risk.