Anyone still on one of the grandfathered plans will see a $5 increase starting in February.
T-Mobile offers competitively priced plans and extensive international roaming.
Please see CNET's Cell phone plan finder to purchase a phone with T-Mobile service.
In this edition of Ask Maggie, CNET's Marguerite Reardon explains who benefits from T-Mobile's new data plans and who doesn't.
This marks the lowest monthly rate for an iPhone in an increasingly competitive environment. The carrier also confirmed it would sell the Apple Watch on Friday.
The latest promotion in T-Mobile's holiday blitz goes after its rival carrier head-on.
But as one hand gives, the other takes away: The 10-gigabyte offering kills off an existing unlimited-data option at the same price.
In an interview, T-Mobile's chief operating officer spills the beans on a potentially attractive, alternative service plan and on its new cross-border program.
The company's promotion will allow people to call Mexico all they want, as well as use their devices in the country, free of charge until 2016.
The nation's third-largest wireless carrier says you can stream videos to your phone without eating up your data allotment. CNET breaks down the details of the plans.
US wireless customers now have new options to call and message family and friends in Cuba.