If you go into Settings > Messages: On my 4: It says "Receive at: 2 Addresses". One is my phone number (which is greyed out) and the other is my Apple ID e-mail. On my GF's 3GS: It only shows 1 address, her Apple ID e-mail, with the only option to add another e-mail, not her phone number. What's the deal here? Both running the iOS 5 GM.