I just received the e-mail from AT&T about my iPhone 4's unlock request being approved, so I'm restoring the phone now. The SIM card that's in the card is deactivated, as I picked up a new iPhone 5c last night. I'm putting up the iPhone on Amazon for sale as soon as it's restored & unlocked, but I was wondering if I should leave the SIM card in there or should I remove it? I know the phone won't operate at all without a SIM card, so I thought perhaps someone that was interested in purchasing one to just use as an iPod Touch would like to have the SIM card installed so that they wouldn't have to provide their own. Is this bad idea? Is there data on the SIM card that I wouldn't want someone else to have access to?