As Rebtel launches version 2.0 of it’s VOIP app on Android, they also announce they have hit 15 million users making it easily the second largest VOIP company after Skype. With a run rate of over 1 billion minutes per year, the company claims it is on pace to hit $75 million in revenue by the end of 2011. This competition in the VOIP sector can only benefit consumers, as you can see with the innovations present in their new app update.

This new app update seems to be more about integrating and getting out of the way rather than drawing users to use an application before every call. Users downloading Rebtel 2.0 won’t have to change their existing way of making a call on their Android device in order to take advantage of their services. Once the application has been downloaded and the user has signed up or logged in, the app will run in the background and seamlessly intercept all calls made to international numbers whether it be from the device’s regular dial pad or native contact list. Instead of being routed over the users’ regular carrier network, the calls will be connected with Rebtel for savings of up to 90% cheaper than standard international calling rates.

Here’s a video demonstrating their new app and the Rebtel service: