After releasing VoIP enabled Truphone for Android earlier this month, Truphone today announced that it has updated the application to operate on Nexus One, which makes the company the first to provide Wi-Fi calling on Google’s device.

In addition to compatibility with the Nexus One, the update (version 3.0.2), ensures compatibility with the T-Mobile Pulse, meaning that Truphone is now Wi-Fi compatible with a total of five Android devices (Nexus One, Puls, HTC G1, HTC Magic and HTC Hero). Compatibility with Motorola Droid is supposed to come soon.

The Truphone for Android integrates a full VoIP engine allowing users to make free calls to Truphone, Google Talk and Skype users when both parties are in Wi-Fi, in addition to low cost calls to landlines and mobiles around the world whether they are in or out of Wi-Fi.

It also includes fully integrated multi-headed Instant Messaging support for Skype, Google Talk, AIM, Yahoo! and MSN customers.

The application builds on the company’s previous release which allowed customers to make low cost calls on their mobiles when out of Wi-Fi. When out of Wi-Fi, the application works by making a local GSM call to the Truphone gateway (if a customer has a bundled package of minutes this call is often free, otherwise is charged as a ‘local call’), from where the call is then routed over the Truphone network.

Calls can be made outside of Wi-Fi using Truphone Anywhere in 33 countries around the world.

The application is available now as a free download in the Android Market.

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