VoIP on mobile devices is such killer app for mobile phones. Here in the states, the carriers seem petrified by the threat. But that is not stopping agile startups from making headway.

After getting the new Nokia N95, I spent some time loading different VoIP clients. The Nokia came with Gizmo, which I have used on the desktop with some success.

Research and testing lead me to Truphone and Fring.

Truphone is a complete VoIP solution offering slick integration with the N95. Fring is a hybrid solution combining proxy-like support for Skype, Google Talk or MSN, and true SIP functionality.

After 24 hours of playing, Truphone has the lead. The quality is great, integration with Nokia is smooth and the cost to get started is low, they even include a dial-in number to allow you to receive calls in the US and UK.

This week I am going to spend with Truphone to see how it performs on WIFI and the Cingular data network.

Next week I will pound on Fring, which also looks to be an excellent solution.

Why no Gizmo or Skype?

Gizmo got the boot for now due to reports of poor call quality when not using WIFI and problems receiving calls. Native Skype support is MIA, since Skype themselves have to build a useable client the S60 platform, which is rumored to be coming.

Luckily, I can access both Gizmo and Skype accounts through Fring.

Time to talk a bunch.

Technorati Tags: iPhone, Nokia, N95, VoIP, Skype