Although T-Satellite is a T-Mobile service, US users on rival carriers can access the satellite connectivity too for $10 per month. Here's how it works and how to sign up.

The $10-a-month T-Satellite service keeps you connected in areas without cellular coverage -- and you don't need to be a T-Mobile subscriber or buy a new phone to use it.

T-Mobile T-Satellite service is now out of beta testing and is available to all US smartphone users, including AT&T and Verizon customers.