Once its hacked it should work fine over 3G.
Other phones have been able to do it over 3G for years.
MuscleNerd has indicated he's going to work on hacking it to work over 3G, so it should be doable.
Well, that's a very different protocol. You can't compare GSM video and FaceTime. Still, MuscleNerd has indicated he's going to work on hacking it to work over 3G, so it should be doable.
What and where are you referring to?