You've seen that little line on your smartphone, but why is it there? We'll explain how to use it—and how to get rid of it on ...

T-Mobile’s free line promo is back, but eligibility rules, fees, and restrictions mean it isn’t truly “free” for everyone.

Naturally, only time will tell if this move turns out to be a good one. But T-Mobile clearly has a vision for its future.

T-Mobile is offering a free line to some users. Here's how you can check your eligibility, plus some more tips and tricks ...