Now this is one intriguing method to make long-distance (international) phone calls for the price of local (domestic) wireless rates (not including any VoIP fees – which are incredibly cheap). RingFree basically allows you to call into their VoIP SIP server, pick the VoIP provider you’d like to use, and dial an international phone number – essentially allowing you to use your regular wireless minutes to make long-distance calls (say, to the UK, Finland, or Serbia).

The RingFree multi-VoIP service is available for iPhone users, and provides and iPhone-like numeric keypad to preserve that iPhone-feel.
Point your iPhone Safari browser to https://rf.com/ and register your iPhone number, some other relevant information, and then verify your PIN. It’s all fairly straightforward and hassle-free.
After you register, you are prompted to select your VoIP provider of choice, enter your destination phone number (via that iPhone-esque numeric keypad), and get your international call going for the price of domestic wireless minutes. There’s some JavaScript transferred over the EDGE data network to get things off and running, but it’s a small bit of code (you should have an unlimited data plan anyway).
Voice quality is reportedly good, and calls go through without too much delay. There’s no WiFi connection required and since barely any data is transferred, you don’t need a strong EDGE signal. Oh, and Google Talk and MSN Voice is supported too.
[Via: iPhone Atlas]