The move makes sense for T-Mobile’s customer base. According to the company, 35% of all international calls and 55% of all international travel from the U.S. was to Canada and Mexico last year. While AT&T offers its Passport service, which allows subscribers to make discounted calls while in Mexico, the company charges $30 to do so.

T-Mobile said in a release that it’s partnered with Mexican and Canadian carriers to offer the same rates abroad, without the need to buy any add-on packages. The company told Quartz that CEO John Legere has said that some of the networks T-Mobile is partnering with include Telefonica, Telcel, Bell, Rogers, and WIND. All T-Mobile customers will be able to take advantage of the plan, whether they are on a monthly or prepaid plan, meaning any short jaunt to Juárez or Toronto will be covered.

This is the latest in a string of moves by T-Mobile to disrupt the major cellular networks in the US with its “Un-Carrier” program. Past initiatives have included getting rid of annual contracts; offering customers on rival networks hundreds of dollars to cover switching costs; allowing customers’ data usage to roll over from month-to-month; and free music streaming that doesn’t count against a customers’ data use.

And it all seems to be working.

T-Mobile also announced July 9 that it added over 2 million customers in the second quarter of 2015, bringing the company to just shy of 59 million total subscribers. T-Mobile said in a release that not only is it growing its subscriber base, but it’s losing fewer customers, too. Churn—or the rate at which customers stop subscribing to a service—was just 1.3%, suggesting customers are generally happy with the service, or at least not bothered enough to switch.

Adding subscribers comes at a significant cost, though. In the first quarter, the company reported a loss of $63 million on revenue of $7.7 billion, citing high operating costs and its investments in growth.