T-Mobile Breaks Price Lock Promises and Drives Up Wireless Costs After Sprint Merger

T-Mobile is migrating approximately 8 million subscribers from legacy service plans to newer, more expensive options, according to reporting from Techdirt. This move follows a series of price increases and fee hikes that have resulted in some customers seeing total rate increases of nearly 60% compared to their original grandfathered plans, as reported by PhoneArena.

The transition is part of a broader shift in T-Mobile’s pricing strategy following its merger with Sprint. While the company previously marketed itself as the uncarrier to differentiate itself from competitors like AT&T and Verizon, recent actions include the termination of over 9,000 employees and the removal of price guarantees for some users.

How much are T-Mobile’s price increases?

T-Mobile describes the current migration as an average $4-per-line adjustment, according to CNET. However, this follows a separate $5-per-line increase that affected many legacy smartphone plans in April 2025.

Beyond monthly plan costs, the company has raised administrative fees. According to data from tmo.report, voice line administrative fees rose from $3.99 to $4.49 per month, marking two increases within a single year. Mobile internet line fees also increased from $1.60 to $2.10.

The cumulative effect of these changes varies by account. PhoneArena reports that some customers on older grandfathered plans are facing total cost increases approaching 60% over their original rates.

Why is T-Mobile removing price lock guarantees?

T-Mobile is facing lawsuits and consumer complaints regarding the violation of price lock guarantees. These guarantees were tied to a promotion launched seven years ago that promised customers their monthly rates would never change.

Critics of the Sprint-T-Mobile merger argue that the reduction in sector competition allowed wireless carriers to stop competing on price. This outcome mirrors warnings issued by merger critics who claimed that pre-merger promises of consumer-friendly pricing would not be maintained once the consolidation was complete.

What is the impact of the Sprint merger on consumers?

The consolidation of Sprint into T-Mobile led to immediate shifts in corporate behavior. Shortly after the deal, T-Mobile began mirroring the operational patterns of AT&T and Verizon, starting with the layoff of more than 9,000 staff members.

The current migration of 8 million users onto newer plans is viewed by critics as a move to eliminate cheaper, legacy options in favor of plans that are more expensive and offer fewer features. This shift contradicts the uncarrier branding the company used to attract customers prior to the merger.

The regulatory environment surrounding the merger also drew scrutiny. Reports indicate T-Mobile engaged in political maneuvering to secure approval for the deal, including the hiring of Corey Lewandowski as a consultant and the elimination of certain diversity, equity, and inclusion (DEI) requirements.