Facetime will work. Given both phones are iPhone 4s and have a wifi connection.
BlackBerry had this before Iphone, whats so special apple been to late.
Poor Apple having bad single problems and missing from shelves lol.
Moreover some color problem, cracks problem. I say they have good revolutionary design but they should have perfected it before mass market release.
Personally I would prefer BlackBerry and HTC truly marvelous.