Face Time's interface is the same regardless of the device.

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You'll need the e-mail address associated with it to log into Face Time and make calls.

After the first sign-in, users are prompted to enter their Apple ID and password.

The latest i Phone captures video that's fine for another i Phone's 3.5-inch display.

The i Pad 2's 9.7-inch display must scale up video from the i Phone's camera, and the result is scratchy, pixelated video on the tablets's screen.

For instance, the small thumbnail of the video feed can be dragged or flicked from one corner to another with your finger, and when your caller switches from the back camera to the front one or vice versa, the video feed actually revolves around to indicate to the other caller what's happening.

When this action happens in each of the other video chat applications, the video feed simply freezes for a split second before it reappears jarringly with different video.

Unlike other video chat apps, Face Time doesn't offer special features such as group video chat or free voice-only calls made over a carrier's data network.

Fring allows users to make up to four video calls at once, and oo Voo Mobile can host up to six audio calls with a single, shared video feed.

On those devices, Face Time is a standalone, pre-installed application.

For the i Phone 4, Face Time works as a feature within the Phone and Contacts apps.

Then, if needed, users can enter another separate e-mail address that other callers can use to find them.