I just did a brief test of Skype video calling on the iPhone – it works on the iPad as well. TMC’s Tom Keating and I tried calling over WiFi and AT&T 3G. WiFi worked amazingly well and the first 3G call I tried just hung.

My second attempt to call Tom’s iPhone 3GS with my iPhone 4 went through and the quality seemed slightly worse than WiFi but still quite good. During the demo I received two non-Skype 3G calls which placed the Skype call on hold. After the calls, the Skype video conversation continued without a hiccup. All this on AT&T’s wireless network.

The benefit of Skype over FaceTime of course is the fact that so many Skype clients are out there – not only on mobile devices but on laptops and desktops.

It is obviously a few days early – it is officially a 2010 release but I do predict Skype video calling to be a killer mobile app for 2011.

Tom writes up the experience we had and adds photos.