KeKu, the VoIP telephone service only launched early this year, but is already reaping the rewards of a fantastic service. With 500,000 customers internationally using their service on both iOS and Android devices, the sky seems to be the limit for this New York-based startup.

KeKu’s apps allow free VoIP calls within their system, as well as inexpensive international rates for both mobile and traditional phone lines. The secret is that they provide local numbers to their users, which can be dolled out amongst their family and friends, regardless of their calling area.

According to Manilo Carrelli, the company’s CEO, their success relies heavily on an exciting viral growth, especially in areas you wouldn’t expect that to occur within. The Middle East has been one of their biggest markets, probably due to the incredible expense of calling both locally and long distance in that region. Canada has also been a key area for them, with a 400% growth since the app’s launch.

The international calling feature seems to be at the heart of their expansion. Users have found that they can use KeKu for local calls and often receive a better rate than they would from their area’s traditional phone service. And fans of Google Voice have been integrating with the KeKu app to direct Google Voice calls to an international phone line while abroad, a feature that Google does not yet provide on its own.

With all of this unexpected growth, KeKu has been able to turn their attention towards additional services for its fans. First down the pipe is an iOS-based group calling app. All you have to do is drag the contacts you want to include into a group folder and tap the call button. It’s simple at the moment, without a lot of bells and whistles, but it certainly gets the job done.

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