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As far as I know FaceTime was not designed with "Wifi only" in mind. I know carriers in other countries allow FT with 3G, usually as an extra feature to the monthly plan.
 
I know it said 'un-jailbroken', however, my list of apps to have beautiful Face time (at the higher FPS rate also vs. stock app) experience via 3G:
Face Time Mod
FaceBreak
FaceTime Hacktivator
and, of course, My3G

Face Time Mod only works at higher FramePerSecond if it is installed on both iphones using it, which is not an issue :) since I usually jailbreak and load stuff for my friend anyhow, so it is one of the apps I always load.

I have My3G on my jailbreak iPhone 4. FaceTime video quality is more clearer than Tango, Fring, Skype and ooVoo. But someone won't get jailbreaking.
 
Will FaceTime be on 3G coverage on iOS 5?

Anybody heard anything if 3G will be able to be used on FaceTime?
 
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