The new iPhone 4 was released earlier this month with a new feature called FaceTime which allows for video calls on the iPhone. However, FaceTime was only designed to work between two iPhone 4 on a WiFi network. This means that you cannot use FaceTime when you are on a 3G network.

But hold on, there is a way to use FaceTime without having a WiFi connection. To use FaceTime without a WiFi you will have to subscribe to AT&T internet tethering service, which will cost you around $15 extra every month.

Once you have enabled this service, you can follow the steps below, courtesy of the DeviceKnit blog.

Step 1: Turn on tethering in Settings > General > Network > Internet Tethering on your iPhone 4 and connect it via USB. You’ll see a new iPhone USBconnection option pop up in the Network preference pane in System Preferences:

Step 2: Go to the Sharing preference pane, and turn on Internet Sharing to share your USB connection over WiFi/AirPort.

Now connect to the new connection you just created instead of using your iPhone 4 3G connection and you can use FaceTime on the go. The only downside to this trick is that you will have to have a laptop handy and pay $15 extra every month. If you don’t want to do that, an iPhone jailbreak for iPhone 4 might solve all your problems.

(Image Credits: DeviceKnit)