Rebtel is an international calling service that was founded in Stockholm, Sweden in May 2006 with the purpose of -- as the company's name suggests -- "rebelling" against the status quo and "fundamentally disrupt the telecommunications industry as we know it."

The VoIP provider is majority owned by its founders Hjalmar Winbladh and Jonas Lindroth and backed by UK venture capital funds Index Ventures and Balderton Capital.

Since its founding, the company has grown to become the world’s second largest mobile VoIP (Voice Over IP) company behind Skype, with 17 million users currently using the service. Rebtel has applications available for the iPhone, Android devices, Windows Phone devices, and even desktop computers.

Rebtel's services offer customers the ability to make cheap international and domestic phone calls and SMS messages. Similar to other VoIP services, these phone calls and messages are free to other Rebtel users around the world.

Rebtel's service differentiates itself from other VoIP and messaging applications on the market by providing some of the lowest rates available. Rebtel also retains a 98% customer approval rating. They offer a new type of VoIP service that allows you to use the service without requiring any kind of special phone, broadband connection or VoIP accessory since the service works both to and from any kind of mobile or landline.

A unique feature of the application is its “Keep Talking” feature. Keep Talking allows users who are talking over Wi-Fi to switch to the mobile network at a moment’s notice. The app will prompt you to tap the Keep Talking button on the call screen to keep the call conversation going seamlessly, keeping users connected to their Rebtel calling conversation even when they leave a Wi-Fi coverage area or experience a degraded connection.

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