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expireddealsb posted Dec 13, 2021 1:28 AM

New Customers/Lines: 128GB Samsung Galaxy S21 5G Smartphone for T-Mobile

$400

$800

50% off
+ Free S/H (Activation Needed)at Best Buy
245K Views
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Deal Details
Best Buy has for New Customers/New Lines: 128GB Samsung Galaxy S21 5G Smartphone for T-Mobile (Phantom Gray, SM-G991UZAATMB) on sale for $399.99 when you follow instructions below (purchase of this device will require activation due to being on T-Mobile network). Shipping is free, otherwise, select free curbside pickup as an alternative option.

Deal Instructions:
  1. Click here for 128GB Samsung Galaxy S21 5G Smartphone for T-Mobile (Phantom Gray)
  2. Select Activate Today then add to cart
  3. Select T-Mobile then click continue
  4. Select Add a New Line or Create a New Account
  5. Continue to follow on-screen instructions
  6. Your total will be $399.99 + free shipping
Thanks to Community member dealsb for finding this deal.

Specs (source):
  • 6.2" 2400 x 1080 120Hz Dynamic AMOLED 2X Gorilla Glass Victus
  • Qualcomm Snapdragon 888 1.8 GHz Kryo 680 Quad-Core Processor
  • 8GB RAM
  • 128GB Storage
  • Wi-Fi 6E (802.11ax) + Bluetooth 5.0 + LE
  • Fingerprint Sensor (Under-Screen)
  • Android 11
  • Rear Camera:
    • Telephoto: 64 MP 1/1.76" Sensor (0.8 µm Pixels) with a 28mm f/2.0 Lens
    • Wide: 12 MP 1/1.76" Sensor (1.8 µm Pixels) with a 26mm f/1.8 Lens
    • Ultra Wide: 12 MP 1/2.6" Sensor (1.4 µm Pixels) with a 13mm f/2.2 Lens (120° FoV)
  • Front Camera:
    • Standard: 10 MP 1/3.2" Sensor (1.22 µm Pixels) with a 26mm f/2.2 Lens
  • Ports
    • 1x USB Type-C (USB 3.1 / USB 3.2 Gen 1)
    • 1x Nano SIM

Editor's Notes

Written by slickdewmaster | Staff
  • About this deal:
    • This price is $400 lower (50% savings) than the list price of $799.99
  • About this Product:
    • Limited 1-year manufacturer's warranty.
  • About this store::

Original Post

Written by dealsb
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Best Buy has for New Customers/New Lines: 128GB Samsung Galaxy S21 5G Smartphone for T-Mobile (Phantom Gray, SM-G991UZAATMB) on sale for $399.99 when you follow instructions below (purchase of this device will require activation due to being on T-Mobile network). Shipping is free, otherwise, select free curbside pickup as an alternative option.

Deal Instructions:
  1. Click here for 128GB Samsung Galaxy S21 5G Smartphone for T-Mobile (Phantom Gray)
  2. Select Activate Today then add to cart
  3. Select T-Mobile then click continue
  4. Select Add a New Line or Create a New Account
  5. Continue to follow on-screen instructions
  6. Your total will be $399.99 + free shipping
Thanks to Community member dealsb for finding this deal.

Specs (source):
  • 6.2" 2400 x 1080 120Hz Dynamic AMOLED 2X Gorilla Glass Victus
  • Qualcomm Snapdragon 888 1.8 GHz Kryo 680 Quad-Core Processor
  • 8GB RAM
  • 128GB Storage
  • Wi-Fi 6E (802.11ax) + Bluetooth 5.0 + LE
  • Fingerprint Sensor (Under-Screen)
  • Android 11
  • Rear Camera:
    • Telephoto: 64 MP 1/1.76" Sensor (0.8 µm Pixels) with a 28mm f/2.0 Lens
    • Wide: 12 MP 1/1.76" Sensor (1.8 µm Pixels) with a 26mm f/1.8 Lens
    • Ultra Wide: 12 MP 1/2.6" Sensor (1.4 µm Pixels) with a 13mm f/2.2 Lens (120° FoV)
  • Front Camera:
    • Standard: 10 MP 1/3.2" Sensor (1.22 µm Pixels) with a 26mm f/2.2 Lens
  • Ports
    • 1x USB Type-C (USB 3.1 / USB 3.2 Gen 1)
    • 1x Nano SIM

Editor's Notes

Written by slickdewmaster | Staff
  • About this deal:
    • This price is $400 lower (50% savings) than the list price of $799.99
  • About this Product:
    • Limited 1-year manufacturer's warranty.
  • About this store::

Original Post

Written by dealsb

Community Voting

Deal Score
+110
Good Deal
Visit Best Buy

Price Intelligence

Model: Samsung - Galaxy S21 5G 128GB (Unlocked) - Phantom Gray

Deal History 

Sale Price
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Current Prices

Sort: Lowest to Highest | Last Updated 7/26/2026, 10:43 PM
Sold By Sale Price
NewEgg$649.99

Top Comments

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700 Comments

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Dec 13, 2021 1:33 AM
2.7K Comments
Joined Jun 2006
kaiotesDec 13, 2021 1:33 AM
2.7K Comments
why dont you add tmobile activation in your title??
Dec 13, 2021 1:41 AM
2.4K Comments
Joined Dec 2005
SlikRickDec 13, 2021 1:41 AM
2.4K Comments
Cheapest plan is $45 for Essentials Unlimited:

50GB priority data
Video streaming at 480p SD and capped at 1.5Mbps
Unlimited hotspot data at 3G speeds
Unlimited texting abroad
Unlimited 2G data in Mexico and Canada
Taxes and fees are not included
Save an additional $5/mo. per line when you enroll in auto-pay. Contact T-Mobile to enroll.
2
2
Dec 13, 2021 3:21 AM
1.2K Comments
Joined Jan 2008
loioloiolDec 13, 2021 3:21 AM
1.2K Comments
why did this get downvoted to oblivion. isn't it a super good deal? you're not locked into tmobile.. just cancel the first day and you essentially get an S21 for $400? cheapest mint condition on swappa is like $680
2
Original Poster
Dec 13, 2021 4:22 AM
182 Comments
Joined Aug 2013
dealsb
Original Poster
Dec 13, 2021 4:22 AM
182 Comments
Quote from loioloiol :
why did this get downvoted to oblivion. isn't it a super good deal? you're not locked into tmobile.. just cancel the first day and you essentially get an S21 for $400? cheapest mint condition on swappa is like $680
No clue why no one found it exciting. I did it earlier today and felt it to be a great price for an unlocked current flagship phone.
1
Dec 13, 2021 5:43 AM
1.2K Comments
Joined Jan 2008
loioloiolDec 13, 2021 5:43 AM
1.2K Comments
Quote from dealsb :
No clue why no one found it exciting. I did it earlier today and felt it to be a great price for an unlocked current flagship phone.
more for me i guess..
Dec 13, 2021 6:30 AM
5.3K Comments
Joined Jun 2010
wpcDec 13, 2021 6:30 AM
5.3K Comments
shows 500 for me, but the TD is because it was listed as "Samsung - Galaxy S21 5G 128GB 399" not with activation by tmobile when first posted.
1
Dec 13, 2021 6:47 AM
82 Comments
Joined Aug 2007
shinjiplusDec 13, 2021 6:47 AM
82 Comments
I'm getting "We're sorry, there was an issue processing your request. Please try again later." when trying to add a line to my existing account.

Anyone know how to fix this?

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Dec 13, 2021 10:47 AM
291 Comments
Joined Nov 2015
rocket007Dec 13, 2021 10:47 AM
291 Comments
Should we allow t-mobile to run a credit check ?
Original Poster
Dec 13, 2021 12:10 PM
182 Comments
Joined Aug 2013
dealsb
Original Poster
Dec 13, 2021 12:10 PM
182 Comments
Quote from shinjiplus :
I'm getting "We're sorry, there was an issue processing your request. Please try again later." when trying to add a line to my existing account.

Anyone know how to fix this?
Can have bestbuy fix it for you in store.
Dec 13, 2021 4:50 PM
24 Comments
Joined Jan 2014
imac61Dec 13, 2021 4:50 PM
24 Comments
Seams fair 399 with an added line
Last edited by imac61 December 13, 2021 at 08:54 AM.
Dec 13, 2021 8:27 PM
95 Comments
Joined Aug 2013
MatthewM4268Dec 13, 2021 8:27 PM
95 Comments
Quote from loioloiol :
why did this get downvoted to oblivion. isn't it a super good deal? you're not locked into tmobile.. just cancel the first day and you essentially get an S21 for $400? cheapest mint condition on swappa is like $680
Is it really that simple to cancel? No catch? Sounds too good to be true.
1
Dec 13, 2021 9:26 PM
95 Comments
Joined Aug 2013
MatthewM4268Dec 13, 2021 9:26 PM
95 Comments
Quote from dealsb :
No clue why no one found it exciting. I did it earlier today and felt it to be a great price for an unlocked current flagship phone.
Are there really no strings attached or repercussions for canceling right away?
Dec 13, 2021 9:33 PM
595 Comments
Joined Aug 2009
xcougarDec 13, 2021 9:33 PM
595 Comments
how does bestbuy process work with "unlocked-activate today " prices? activate later is 300$ more.
Dec 13, 2021 9:49 PM
1.3K Comments
Joined Nov 2011
resseekerDec 13, 2021 9:49 PM
1.3K Comments
Interested to hear someone's actual experience.. when you go to add to cart it asks which carrier you want to activate on. Cheapest being TMO, but it has to be a new line/account. Wondering how this works out if you create a new account and purchase/terminate.

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Original Poster
Dec 13, 2021 9:54 PM
182 Comments
Joined Aug 2013
dealsb
Original Poster
Dec 13, 2021 9:54 PM
182 Comments
Quote from MatthewM4268 :
Are there really no strings attached or repercussions for canceling right away?
As I understand it yes. The most they could do is charge you for 1 month of service.
Bestbuy had a lot of trouble figuring out the T mobile account. They ended up giving the phone at the same price without the hassle of having to deal with T mobile.

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