T-Mobile's free line offer is giving some customers a very expensive surprise
Don't be too shocked if your next bill looks higher after adding that free line.
Don't be too shocked if your next bill looks higher after adding that free line.
![Some T-Mobile customers can track real-time location of other users and random kids without permission [UPDATED]](https://m-cdn.phonearena.com/images/article/169135-two/Some-T-Mobile-customers-can-track-real-time-location-of-other-users-and-random-kids-without-permission-UPDATED.jpg?#)
