T-Mobile is moving customers off its oldest plans

We’ve retired our oldest plans, some of which were established nearly 15 years ago — in the 3G and 4G era, and long before our 5G network was fully deployed. Customers will move to modern plans that provide access to America’s best wireless technology, enhanced features and a 5-year price guarantee for peace of mind. Some customers will see no change to their monthly bill, while others will see a modest adjustment. Every customer who switches to a new plan will retain their current benefits while gaining improvements in network and service experiences.