Back in 2007 there was a lot of talk about VoIP company Jajah and their attempts to bring a client to the iPhone; in the end, AT&T’s definition of “conference signal services” scuppered those plans and Jajah instead launched an iPhone-formated web interface for their ring-back service.  With the arrival of the official Apple SDK, however,

Jajah are now apparently working on a native VoIP client for the iPhone, thanks to Cupertino’s blessing that software which routes voice calls by the Net will be permitted on the handset as faraway as it uses WiFi, not EDGE, for their connection. 

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Original post by Chris Davies