I've noticed that only one person mentioned Tango (besides me).
Doesn't anyone use Tango?
Tango is an app on both Android and iPhone. If FaceTime is a problem, then switch to Tango?
My wife has iPhone, but she uses Tango and Skype.
She only uses FaceTime with her grandmother (who's too stubborn and technologically inept to use other 2-way video apps).
I think it is more about the principle of it, rather than which software is being used. However, you've got a point. Tango is available as an alternative that hearing and deaf both can use.