T-Mobile has just rolled out its fastest home broadband option: a 5-gigabit fiber plan priced at $90 per month, accompanied by a promise that the rate won’t climb for a full decade. This new plan joins three existing fiber tiers and is available starting now.
New Fiber Tiers with a 10-Year Guarantee
The updated lineup of T-Mobile’s fiber-optic home broadband now includes four speed options: 300 Mbps at $35/month; 1 Gig at $55/month; 2 Gig at $70/month; and the flagship 5 Gig plan at $90/month. All prices assume you enroll in autopay billing and exclude taxes and fees. For a limited period, customers can unlock bonuses such as two months free in bill credits and a $300 virtual prepaid card—provided they stay connected for at least one year.
What sets the 5-Gig offering apart is the 10-year price guarantee for new subscribers. Once you lock in at the $90 rate, T-Mobile promises it won’t increase your monthly fee for ten years—so long as you don’t switch to a faster plan, add optional equipment, or accept other upgrades.
Why 5-Gig Matters—and What to Watch Out For
With data demands surging—thanks to streaming, gaming, smart home tech, cloud backups, and the rising prevalence of video conferencing—upload speed matters as much as download. T-Mobile’s fiber plan delivers symmetrical uploads and downloads because it uses fiber-optic cable directly to the home. That means the full gigabit (or in this case, 5 gigabits) is usable in both directions—crucial for households with multiple users working remotely or running intense networked applications.
Despite the price guarantee, there are limits. Taxes, regulatory fees, optional addons, and certain promotional promotions aren’t covered. Importantly, upgrading to a faster plan in the future voids the locked $90/month commitment. Additionally, availability still depends on local infrastructure, so potential customers will have to check if 5-gig fiber is offered in their area.
T-Mobile frames this new tier as built for “the busiest households”—those juggling heavy streaming, high-demand gaming, multiple smart home devices, and advanced tools powered by AI. The 5-gig speeds are meant to support all of that simultaneously without bottlenecks.
Price guarantees like this aren’t widely offered, particularly with such a long timeframe, so this move puts T-Mobile in a competitive position among fiber and broadband providers. Consumers often worry about surprise rate hikes, and guaranteeing pricing for ten years is a strong statement.
What this means: for users with compatible infrastructure and very high bandwidth needs, the 5-gig plan may finally deliver premium performance without premium uncertainty. For the industry, this raises the bar on what consumers expect from telecom providers in terms of stability and speed. Moving forward, keep an eye on how many homes T-Mobile can reach with this level of fiber deployment—and how competitors respond to this rare long-term pricing assurance.
