Welknown and also well used magicJack, the VoIP service that is offered with a USB device providing free calls for the cost of the device and a yearly fee of $19.99 to users in the U.S. and Canada. Each device purchased Magicjack or Magicjack Plus includes one year service. So the free calls is a kind of misnomer.
It is also very difficult to find any pricing information at the Magicjack site easily. Positive side of this is the happy users. I have a coleague who uses Magicjack and you would not know he is calling you via a VOIP service.
But the news today is that Magicjack has released an iPhone app. magicJack app came to the iTunes App Store this week and lets users make free calls to numbers in the U.S. and Canada and to other magicJack users anywhere in the world at no charge. The app works on all iDevices provided that have iOS 4.0 or higher.
magicJack is not alone in the Free VOIP calling space on the iTunes App store, it joins the likes of Skype, Viber, netTALK.
Unlikewith the Magicjack devices described above, magicJack App does not require you to create an account before you can start making those free phone calls, (out going only). The App offers you the option to skip account creation and go right to the dialer shown above. By creating an account to get voicemail and a designated magicJack phone number, or information from an existing account one can receive calls through magicJack without using minutes on your cell phone plan. In the U.S. incoming calls count against your cell phone plan).
I have not tried the app yet and many of those who tried praise the app and it's abilities. Many have made calls over wifi and 3G and seem to be satisfied.
iTunes App Store