T-Mobile has started notifying customers that it is retiring legacy plans and moving subscribers to current rate plans, according to The Verge. The legacy plans being retired include plans from the 3G era, as well as Magenta, ONE, and Simple Choice plans. Affected customers are being automatically moved onto modern 5G plans, reported by Gadget Review.

Billing changes for the current wave of migrations will hit in mid-July, according to Gadget Review. T-Mobile frames the current migration as an average $4-per-line adjustment. However, some grandfathered customers are absorbing rate increases near 60%, and some legacy smartphone plans experienced a $5-per-line rate hike in April 2025, according to Gadget Review. The average cost increase does not reflect the actual cost increases for many legacy customers.

T-Mobile previously promised it would never change the price customers pay for their T-Mobile ONE plan, according to Gadget Review. T-Mobile sent notifications regarding rate changes after previously stating it would not surprise customers with hikes. The migration process is proceeding in a manner consistent with expectations. T-Mobile removed 8 million customers from their grandfathered plans.