3CX offers free SIP-based VoIP app for iPhone.
Standards based SIP softphone allows iPhone, iPad and iPod Touch users to make calls via Wi-Fi and 3G.
London, January 26 3CX, developer of the popular Windows softphone 3CXPhone and VoIP PBX 3CX Phone System, has expanded its mobile offerings with the launch of an iPhone-compatible version of its Windows-based softphone. The 3CXphone for iPhone app allows the user to make FREE VoIP calls via WiFi or 3G.
The difference between the 3CXPhone for iPhone and other free SIP phones for iPhones is that this app isnt locked into a particular provider or PBX. You are given the freedom of selection, meaning that you can pick and choose your favorite provider or VoIP PBX and switch at any time or use different VoIP providers.
Follow the link below to read the full press release:
3CX delivers free VoIP / SIP phone for iPhone