VoIP over data connections (3G, Edge) are now authorized on the Apple AppStore finally! Check for example, VoIPSWITCH’s Vippie

The new release of Symbian dialer is available for demo on VoIPSWITCH www.callto.net website. The dialer uses special compression algorithm which allows for 50% saving in bandwidth consumption. The voice codec remains the same, it is g729. The improvement helps clients making calls using very low internet bandwidth, often from blocked areas, for example UAE. [...]

VoiceServe, Inc. has phenomenal accomplishments which include over 14,000 successful VoipSwitch system deployments and a 107 % increase in annual revenue for their fiscal year ending March 31, 2009. They are also known for choosing the best venues for meeting, exhibiting, sponsoring and participating in global conferences such as ITEXPO.
At the ITEXPO East 2009 in [...]