you could always try it and see. testing takes less time than posting and waiting on a reply
I tried this app last week. Only allows VOIP over WIFI. I'm sure all the phone carriers have insisted that Apple not let an VOIP over 3G app into the AppStore. Think about it, it'd kinda take away from the phone carriers business.
I assume that you are talking about WITHOUT VoipOver3G??? I already knew that this version didn't support 3G out of the box. I was wondering if it works with the VoipOver3G addon.