Featured promotions at T-Mobile at Costco

T-Mobile Network Performance

Data provided by Umlaut From July-2025 to December-2025   See coverage map
5G network score
The higher your score, the more likely you can connect to a faster, more stable network.
93
/100
AT&T
83
/100
Verizon
68
/100
5G coverage availability
More availability means having access to 5G speeds more often.
81 %
89 %
AT&T
71 %
Verizon
5G download speed
Higher speed means quicker downloads and smoother video calling.
253
Mbps
AT&T
63
Mbps
Verizon
12
Mbps
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T-MOBILE TRIAL

Try T-Mobile FREE
for 30 days.

Test-drive our award-winning network and some of our favorite benefits for 30 days—no commitment or credit card required. We won’t even tell your other carrier.

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Qualifying non-T-Mobile network user & compatible, unlocked device required. 1 trial user. See 5G device, coverage, & trial details at T-Mobile.com.

Featured reviews at T-Mobile at Costco

Paula Rossell
May 31, 2026, 9:41 p.m.
Our experience with Zagreus was superb. She was knowledgeable, professional and extremely patient. It was a 2 step process, that went as smoothly as possible. We highly recommend using this location for your phone needs. View on Google
Sylvia Quesada
May 30, 2026, 9:49 p.m.
I just ported five phone lines over to TMobile at this kiosk. All three employees were nice and Zagreus handled the whole thing with patience and grace. It took a long time (3 hours!) but it was complicated - two of the lines were in another state, and we also had a pre-existing TMobile Fiber account to combine with the new phone account. Zagreus made sure everything worked correctly on each phone before we left, including talking to the users not with us through the steps to be successful. Chances of me achieving all this on my own via the TMobile app would have been nil, plus we got the great Costco/TMobile shopper cards and port-in credits. Happy with my experience here today! View on Google
Jim Liao
May 29, 2026, 2:19 a.m.
I want to recognize Ms. Zagreus Darrow at the T-Mobile kiosk in the Superior, CO Costco for her outstanding service on May 26th. Before working with her, I had spent over six months, made more than 12 support calls, and visited T-mobile stores elsewhere multiple times to resolve a business account refund issue, only to receive a partial refund. Out of frustration, I had already requested T-Mobile's legal address and was prepared to file a small claims lawsuit. Ms. Darrow completely turned the situation around. She spent an hour and a half on the phone with T-Mobile business support, meticulously documenting IMEI numbers and account history on her own notes. She identified a processing gap in past call logs and guided the support representative toward a solution. Remarkably, she did all this while seamlessly helping a colleague manage customer questions in the store. Two days later, T-Mobile called to confirm the full refund was processed. Ms. Darrow’s dedication, problem-solving skills, and empathy single-handedly saved a customer relationship and prevented a legal escalation. T-Mobile is incredibly fortunate to have her on their team. View on Google

Additional information about T-Mobile at Costco

IDs Accepted
  • US State issued drivers license
  • US Passport or Permanent Resident Card (Green Card)
  • State ID
  • International student visa with passport (Visa types: M, J, F)
  • Matricula Consular card (Mexico and most Latin American countries, check with your store mobile expert)
  • Employment Authorization Document (EAD)
  • US Military ID
T-Mobile at Costco - 600 Marshall Road
T-Mobile at Costco - 600 Marshall Road
The leader in 5G – Now America’s largest 5G network is also America’s fastest and most reliable 5G network. Shop T-Mobile at this location. Please contact this location for full service options.
  • Activate Wireless Service
  • Activate Home Internet Services
  • Upgrade or Trade-In Your Phone
  • Exclusive Member Benefits

Locations near T-Mobile at Costco

T-Mobile Experience Store
T-Mobile The Orchard Town Center
9.7 miles away
T-Mobile Experience Store
T-Mobile 55th & Wadsworth
12.4 miles away
4.2
T-Mobile Experience Store
T-Mobile Village At The Peaks
13.3 miles away

Got Questions about T-Mobile Stores?

Yes. Check out our special offers for new phones and great deals on our mobile phone plans.

We offer the latest iPhones. Check our store inventory and either buy in-store or online today.

Yes. Trade in your phone at a T-Mobile store and receive instant appraisal and credit. See our trade-in guide for details.

Yes, visit our T-Mobile store at T-Mobile at Costco for assistance with setting up your device.

Browse devices and plans online, contact us for assistance, or visit this T-Mobile location at T-Mobile at Costco for personalized help.

Yes. Some plans include subscriptions to services like Netflix or Apple TV+. Check our plans for available perks and add-ons.

Use our Store Locator to find the nearest T-Mobile store.

T-Mobile stores offer a wide range of accessories compatible with your device, including cases, chargers, and headphones.

No, you can pay your bill online through our website or the T-Mobile app.

Only compatible devices can use T-Mobile's 5G network. All new phones are 5G ready.

The T-Life app provides a simplified experience for customers by offering everything in one convenient location. In the T-Life app, T-Mobile and Metro by T-Mobile customers can access the same great perks and exclusive deals you know and love from T-Mobile Tuesdays, VIP benefits, and more! Plus, you can easily manage most aspects of your T-Mobile account directly from the T-Life app, with new features being added regularly.
Yes, the T-Life app can be found in your Google Play Store or Apple iOS App Store