Transfer of iPhone Ownership I have an AT&amp;T family plan.  My niece has an HTC smartphone and hates it.  I have a 3G iPhone.  I want to give her my iPhone and get a newer one with my upgrade.  I don't know how to transfer ownership of my 3G iPhone to my niece.  Do iPhones have SIM cards and if they do, how do you get to it?  Thanks so much for any help.
To remove the sim card, insert the sim remover tool (that came in the box, shown below) or any other thing object such as a straightened paper clip, hair clip, etc. into the small hole on the top of the device to extract the sim card tray.