Independent authorized sales agentT-Mobile Fiber Customer Service: Official Support Options (Guide)
How to reach T-Mobile Fiber's official support — and how to order new service through Reliable Internet Inc, an independent sales agent (not T-Mobile Fiber).
New customers onlyPlus taxes and feesStandard rates after the promoIndependent authorized sales agent, not T-Mobile Fiber
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Check availability at your address
(888) 428-0573- Authorized sales agentWe sell participating providers' plans; we are not the provider.
- Prices from provider sitesEach price links to its source and check date.
- Availability by addressCoverage is confirmed for your exact address.
- Order by phoneTalk to a person at (888) 428-0573.
| Purpose | T-Mobile Fiber number | Hours |
|---|---|---|
| T-Mobile Fiber Care (account, billing, tech support) | 833-421-3636 | Phone and chat, daily 4 a.m.–12 a.m. PT |
| General T-Mobile customer care | 1-800-937-8997 | — |
Last verified: Nov 6, 2026. Official source: fiber.t-mobile.com's support page. Our number, (888) 428-0573, is a sales line for new orders. Reliable Internet Inc is an authorized sales agent and can't reach your T-Mobile Fiber account, so for account help use the number above.
T-Mobile Fiber Care is the dedicated line for people already on T-Mobile Fiber service. The support site's chat bubble connects to a live agent during the same hours as the phone line. If your question is about a Metronet account from before the T-Mobile acquisition closed in September 2025, T-Mobile's own transition page says to keep using your existing login and contact details while the two brands finish combining.
Ways to Contact T-Mobile Fiber Support
- Phone or chat: 833-421-3636, daily 4 a.m. to 12 a.m. Pacific.
- T-Life app: T-Mobile's account app, used across its fiber, 5G home internet and wireless lines, for bill pay and account management.
- Support site: fiber.t-mobile.com's help section covers setup, troubleshooting and account topics.
Source: fiber.t-mobile.com support pages, checked Nov 6, 2026.
Moving or Cancelling T-Mobile Fiber
T-Mobile Fiber is tied to the address it was installed at, so if you move, check availability at the new address before you cancel the old one; fiber only reaches homes on Metronet's existing or in-progress build-out. Call 833-421-3636 to start a move or a cancellation. Return any leased equipment per the instructions T-Mobile Fiber Care gives you to avoid a non-return charge.
T-Mobile Fiber Was Metronet
Metronet built the fiber network T-Mobile Fiber now sells. A joint venture between T-Mobile and KKR bought Metronet in a deal that closed in September 2025; T-Mobile Fiber took over residential sales, billing and customer-facing support, while Metronet's team kept building and running the network. If you were a Metronet customer, your service and account continue under the T-Mobile Fiber name.
Source: Metronet's "What's Happening with T-Mobile and Metronet?" page, checked Nov 6, 2026.
Shopping for a New Plan?
Call (888) 428-0573 to order or compare T-Mobile Fiber plans. Reliable Internet Inc is an authorized sales agent; this is not T-Mobile's support line.
Frequently asked questions
What is the T-Mobile Fiber customer service number?
833-421-3636, for phone and chat support, daily 4 a.m. to 12 a.m. Pacific.
I'm a former Metronet customer. Do I need a new account?
No, based on T-Mobile's own transition messaging; keep using your existing login while the brands finish combining. If you run into an issue, call 833-421-3636.
Does T-Mobile Fiber have 24/7 support?
Not quite. Phone and chat are listed as daily 4 a.m. to 12 a.m. Pacific, not around the clock.
Questions about T-Mobile Fiber?
Mon–Fri 8am–10pm ET · Sat–Sun 9am–7pm ET