iPhone 4 owners should now be able to make FaceTime calls over 3G as a result of two recent software updates. The first is a fix to JailbreakMe, properly enabling FaceTime on jailbroken devices. An unauthorized app, My3G, has at the same time been updated with FaceTime support. The software fools iOS into treating a 3G connection as Wi-Fi, undoing artificial limits in some apps.
