I'm using 3G unrestrictor. Says it works with FaceTime so we shall see. It's late so I dont want to FaceTime someone right now haha.
Here is an answer that worked for me on another forum:
Both my3g and 3g unrestrictor should work,
1. after install, set Facetime IsDirect flag to on (do this within My36 or 3G Unrestrictor settings),
2. go to sbsetting turn off and then back on my3g or 3g unrestrictor,
3. respring,
4. turn on wifi (but don't need to connect to any connection),
5. it should work