You'll need your iPhone's IMEI number if you want to unlock it and use it on a different cellular provider.

You can find your phone number on an iPad associated with either its SIM card or FaceTime account, depending on your iPad's ...

I don't know my wife's phone number. If I needed to call her and I didn't have my iPhone, I wouldn't be able to reach her. And according to a poll by WhistleOut, I'm not alone. About 17% of ...