If you want to enjoy facetime realy when you are on go without wifi ? so here is the soloution, its quality is not so good but you still enjoy it when you are on move. Video and instructions after the break

Setup Instructions:

1) You need a jailbroken iPhone 4 if you dont have one you can Jailbreak your iPhone 4 via www.jailbreakme.com.

2) Open Cydia, Go to Manage then Sources.

3) Click Sources, and add http://apt.modmyi.com

4) Search for “My3G” and install it.

5) FaceTime should now work over 3G!

[Via 9to5mac]