T-Mobile's Bobsled brings free Facebook voice calls to mobile applications and the web

Today, T-Mobile is expanding its efforts to let you call your Facebook friends for free with the launch of its new Bobsled VoIP (Voice over Internet Protocol) apps on iOS, Android, and the web.

The new apps greatly increase the presence of T-Mobile’s Bobsled service, which launched back in April on Facebook as a way to easily call your friends on the social network. And as an extra nicety, the Bobsled web app as well allows you to call any phone number in the US, Canada, and Puerto Rico for free from your desktop browser.

There are already plenty of mobile VoIP offerings available, including Rebtel and Viber, however Bobsled is the first to be solely devoted to letting you chat with your Facebook followers. That may ultimately help the Bobsled apps become more widely adopted, especially among teens and users who keep a close watch on their monthly cellular voice minutes.

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Devindra Hardawar is VentureBeat's lead mobile writer and East Coast correspondent. He studied philosophy at Amherst College, worked in IT support for several years, and has been writing about research since 2004. He now lives in Brooklyn, New York. You can reach him at devindra@venturebeat.com, and on Twitter at @Devindra.