T-Mobile Launches $90 5 Gbps Fiber Plan With 10-Year Price Lock

T-Mobile is selling a 5 Gbps home fiber plan for $90 a month, with a 10-year price guarantee that undercuts Google's GFiber on a per-gigabit basis. The tier, introduced this week, sits at the top of a fiber lineup the carrier has built in just over a year.

That lineup is now four tiers deep. The 5 Gbps plan joins the existing 2 Gbps service at $70 a month, the 1 Gbps plan at $60, and a 300 Mbps entry tier at $45. Every plan ships with symmetrical upload and download speeds — a real upgrade for anyone leaving a traditional cable provider whose uploads crawl.

Why the 10-year price lock matters

Legacy cable operators made a habit of raising prices and forcing customers through retention hoops to keep their old rate. T-Mobile's decade-long guarantee targets exactly that frustration. The fine print, though, carves out plenty: "Taxes & fees, voluntary equipment or speed upgrades, select limited-time promotions, per-use charges, third-party services, and network management practices aren't included." The lock covers the base rate. Not the bill.

The $90 sticker also has a condition. Customers must enroll in AutoPay to get it.

How the pricing stacks up

Against the competition, T-Mobile's math is aggressive. GFiber, Google's fiber operation, charges $100 a month for 3 Gbps and $150 for its 8 Gbps tier. T-Mobile delivers 5 Gbps for $10 less than GFiber's slower 3 Gbps plan.

To sweeten the switch, T-Mobile throws in hardware and cash. Every 5 Gbps customer receives a mesh Wi-Fi extender that broadens coverage of the included Fiber gateway. New customers get two months of free service via bill credits, plus a $300 virtual prepaid debit card.

A footprint built in a year

T-Mobile launched its home fiber service in the United States just over a year ago, using its acquisition of Lumos as a springboard. At launch, the service reached half a million customers nationwide, topping out at 2 Gbps. The new 5 Gbps tier marks a 2.5x speed boost over that original ceiling — and signals T-Mobile intends to compete on speed, not just price.

Fiber isn't the only string in the bow. Where T-Mobile's fiber footprint hasn't reached, the company sells its unlimited 5G Home Internet service, with prices starting at $50 a month. That gives the carrier a two-track strategy: fiber where the physical network exists, fixed wireless everywhere else.

What comes next

The 10-year guarantee is the sharpest weapon here. It converts a speed announcement into a pitch about certainty — and if T-Mobile keeps expanding the fiber footprint it built from a half-million-customer base in twelve months, cable operators will face pressure on both price stability and symmetrical speeds.