My friend recently got an Iphone4 so I wanted to try and FaceTime her but when I call her it doesnt work. Ive tried using FaceTime when im in the phone call and also just doing it thru contacts and not making a phone call. We both are on Wifi but it doesnt connect. After I cancel the FaceTime call because it doesnt go thru a message pops up saying she missed my Facetime call but she never got an invite to accept. When I do it thru the call there is also a question mark over the facetime icon, dont know if that has anything to do with it. Any suggestions on what can be wrong?