said by georgeglass5:not good enough? Used yahoo video call that worked fine, as well.
Skype is fine, but you need to leave it running in the background all the time (using Apple's VOIP service) to receive calls, which prevents the phone from going to sleep and drains the battery.
FaceTime uses push notifications. It only activates and runs when the user responds to an incoming FaceTime request. So the phone can go to sleep and all that other good stuff.
Basically FaceTime works like a normal phone (i.e connection is only active when "on a call"), while Skype works like an instant messenger program (connection is always active). So while Skype is more widely available, FaceTime is "mobile friendly".