I plan on selling my 3g on craigslist, i just want to make sure that none of my info is on the phone and is safe to sell. I did the settings->erase all content and settings option, and now the phone asks to be plugged to an itunes account. Also i removed the sim card. Is that all i need to do? Also I registered the phone when i first got it (like a year ago), do i need to be worried about the serial number or whatever tied to my personal information?