T-Mobile might not be an official carrier for the iPhone in the US, but that doesn't mean you can't make T-Mobile phone calls on your iPhone.
The company has released its Bobsled app for iOS. Bobsled is T-Mobile's web-based phone and messaging service. With it users can call anyone in their Facebook contacts for free in the US, Canada, or Puerto Rico. Even if you are outside of the US, you can call any of your Facebook contacts in those countries for free.
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