With that intent, the company has signed-up to Apple's iPhone Developer Program to create what it calls "possibly the first native global VoIP application" for the device. The company hopes to ship its solution this summer, soon after the release of the iPhone 2.0 software.

The company already offers a web-based call-back solution for the iPhone, offering a way users can place international calls without being subjected to expensive mobile phone international calling tariffs.

The new VoIP client for the iPhone will enable users to make free or low-cost global calls to any phone in the world using WiFi.

“Jajah was one of the first in line to support the launch of the iPhone. Now with the release of the iPhone SDK, we are excited to develop a native VoIP application that will improve productivity and enhance the communication capabilities of mobile professionals with added security,” said Frederik Hermann, director, global marketing.