New day, new app in Cydia store: FaceBreak. This tweak is very simple to use and allows you to make FaceTime calls over 3G. Once installed on your iPhone all you need to do is to reboot your iPhone, and that’s it.
You can buy FaceBreak from the Cydia store for $1,49.
NOTE: to use FaceTime over 3G you can use My3G or 3G Unrestrictor