Wow I just got my account opened with their service and its awesome. Of course it's wifi only, but the calls are 8c Austrailian which is about 6cents US. And thats not per minute, thats 6 cents per call untimed, talk as long as you want, I didnt get any delay and the call quality was better than my AT&T calls are! They even have a plan thats $5 Austrailian which is about $3.50 US and with it you get 80 free untimed calls, plus the 6 cents per call, calls after that. Im sold on them until Skype comes out with an official app. And they do provide SIP so you could use them with Fring if you really wanted to. But there is a native PennyTel app on the iTunes store, just search voip or pennytel.