Featured promotions at T-Mobile at Costco

T-Mobile Network Performance

Data provided by Umlaut From April-2025 to September-2025   See coverage map
5G network score
The higher your score, the more likely you can connect to a faster, more stable network.
86
/100
Verizon
85
/100
AT&T
79
/100
5G coverage availability
More availability means having access to 5G speeds more often.
94 %
88 %
AT&T
75 %
Verizon
5G download speed
Higher speed means quicker downloads and smoother video calling.
318
Mbps
Verizon
154
Mbps
AT&T
44
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

Jack Muehlbauer
April 7, 2026, 6:38 p.m.
Shoutout to David at T-Mobile in Costco! He really knows his stuff and made sure I understood all my options without being pushy. The whole experience was smooth from start to finish, and I’m super happy with the deal I got. Go see David, he'll take care of you! View on Google
Jennifer Behret
April 7, 2026, 2:29 p.m.
If you’re thinking about switching to T-Mobile or upgrading your phone, do yourself a favor and go to the T-Mobile kiosk inside Costco instead of a regular T-Mobile store. They have exclusive deals and promotions you literally can’t get anywhere else. David helped me out and was super knowledgeable about all the Costco-specific offers. He made sure I got the absolute best value. The whole experience was easy and no-pressure. Definitely worth the trip! View on Google
Caroline Wyatt
April 7, 2026, 2:28 p.m.
Had a great experience at the T-Mobile kiosk inside Costco! David was incredibly helpful and knowledgeable — he took the time to walk me through the different plans and promotions without any pressure. He made the whole process smooth and easy, and I left feeling confident I got the best deal. Highly recommend asking for David if you stop by! View on Google
Jesus Alvarez
April 5, 2026, 9:32 p.m.
We came to this T-Mobile store to learn about switching from Verizon, and left completely satisfied. The staff was welcoming, but David went above and beyond. He personally managed our entire transition, keeping us updated throughout via text and calls. Even when we changed our phone order, David handled it effortlessly to ensure we didn't miss our promotional deadline. This was an exceptional customer experience! View on Google
David LaBarr
April 4, 2026, 10:57 p.m.
Costco gave me far more money in my switch from Verizon then the other normal T-Mobile stores were offering. I think the deals are for Costco members only here. Everything seemed differently. Will update if anything goes wrong. 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 - 2900 Cumberland Mall SE
T-Mobile at Costco - 2900 Cumberland Mall SE
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 Akers Mill Square
0.5 miles away
5.0
T-Mobile Experience Store
T-Mobile Ashford Lane
7.9 miles away
5.0
T-Mobile Experience Store
T-Mobile Thornton & Blairs Bridge
10.5 miles away
5.0

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