More sustainable than new

Galaxy S21 Ultra 5G 128 GB - Phantom black - Unlocked

  • Galaxy S21 Ultra 5G
1 - 4
  • Current
$1,299.99 new

$300.25

Lowest price
Affirm
Installment plans.
Works with all carriers

US Mobile - Prepaid SIM Kit

Comes with

Good Karma
Charging cable

For you? Only the best.

Refurbished and sold by CertifiedDirect

Live on Back Market since 2021

Accepts

VisaMastercardDiscoverAmerican ExpressPayPalApple Pay

Often bought together

Galaxy S21 Ultra 5G's customer reviews

4.2/5

395 verified reviews in the last 6 months.

  • L

    Lawrence W.

    5/5

    Reviewed in the United States on December 29, 2022

    Was kind of worried about a refurbished phone.Ordered the Samsung S21 ultra in very good condition. It came in 3 days. To my surprise it was in excellent condition. Stuck in sim card and fired it up and is running like a champ.Back market you have me as a customer forever.
    Galaxy S21 Ultra 5G 512GB - Phantom Black - Unlocked

    Purchased on December 17, 2022

  • L

    Levander L.

    5/5

    Reviewed in the United States on February 26, 2023

    Hello. This is my first time ever ordering a refurbished, well, anything! So needless to say. I cautiously ordered a Samsung S21 Ultra after reading through many reviews. Boy was i nervous. Not because of the reviews, but i was a mere virgin at this. All i wanted was an ultra with a snapdragon processor and screen and camera unblemished. And then there are the fakes i hear about. $450 on the line here. But i was absolutely blown away and on my children, i am not a bot but i ordered early morning and my phone arrived by the end of the next day. Back market made my freaking year! Im a 5 star satisfied,and from now on persisting customer. Thank
    Galaxy S21 Ultra 5G 128GB - Phantom Black - Unlocked

    Purchased on February 23, 2023

  • E

    Elijah P.

    4.4/5

    Reviewed in the United States on April 26, 2023

    Definitely a great pickup. Was hesitant because I know refurbished products are never as good as new but this phone seems to put that claim to rest. I did order the fun in very good condition, however. It has only been 2 weeks, but the Samsung Galaxy S21 Ultra has been good to me.
    Galaxy S21 Ultra 5G 256GB - Phantom Silver - Unlocked

    Purchased on April 13, 2023

  • P

    Phyllis H.

    5/5

    Reviewed in the United States on January 7, 2023

    Nothing short of awesome ! I wasn’t expecting such a nice phone when I purchased a refurbished one, but to my joy I was shocked. Delivery was very fast. Thank you Back Market, you made everything so easy !
    Galaxy S21 Ultra 5G 128GB - Phantom Black - Unlocked

    Purchased on December 24, 2022

  • T

    Troy C.

    4.3/5

    Reviewed in the United States on May 15, 2023

    Awesome phone. If this was refurbished, I couldn’t see one single nick or scratch. The phone works beautifully. I thought you guys were a scam at first, due to your super low prices, but I will shop here for tech goods and no where else again. You guys are fantastic. Thank you so much. Austin
    Galaxy S21 Ultra 5G 128GB - Phantom Black - Locked Verizon

    Purchased on April 25, 2023

  • W

    William D.

    5/5

    Reviewed in the United States on April 16, 2023

    I purchased a galaxy s21 ultra last year for myself. Recently I purchased another galaxy s21 ultra for my wife. Excellent product, never any problems, Back Market is my choice for reconditioned phones. Also they keep in touch to insure their customers are happy after the purchase..
    Galaxy S21 Ultra 5G 128GB - Phantom Black - Unlocked

    Purchased on March 8, 2023

  • M

    Musa T.

    5/5

    Reviewed in the United States on February 4, 2023

    I am very happy with my purchase of the Galaxy S21 Ultra. The phone is refurbished however its difficult to tell by how clean and in good condition it looks. I am very much satisfied with my purchase.
    Galaxy S21 Ultra 5G 128GB - Phantom Silver - Unlocked

    Purchased on February 1, 2023

See all 395 reviews

Reborn vs. brand new
Here’s what you help prevent on average by choosing a reborn smartphone over a brand new one.

171.1 lbs of CO2e

That's like driving an SUV from NYC to Chicago.

6.3 oz of e-waste

That’s around the weight of a baseball.

537.1 lbs of raw materials

That's like 20 dogs digging in your yard for a week.

20,341.2 gallons of water

That's like running a faucet for 3 days

Everything you ever wanted to know about the Galaxy S21 Ultra 5G

Galaxy S21 Ultra 5G 128GB - Phantom black - Unlocked


Our partners are electronics experts who test and verify that each item is 100% functional before it leaves the workshop. This is the reason you benefit from a minimum 1-year warranty with the purchase of a refurbished device at Back Market.

Galaxy S21 Ultra 5G - 128 GB - Phantom black - Unlocked

  • Manufacturing part numbers (MPN) : SM-G998UZKAXAA
  • Screen size (inches) : 6.8
  • Color : Phantom black
  • Carrier compatibility : Unlocked
  • Storage : 128 GB
  • Model : Galaxy S21 Ultra 5G
  • Megapixels : 3200 x 1440
  • OS : Android
  • Memory : 12 GB
  • eSIM : Yes
  • Processor brand : Qualcomm
  • Processor Core : 8
  • Resolution : 1440 x 3200
  • Foldable : No
  • Screen type : Dynamic AMOLED 2X
  • Connector : USB-C
  • Network : GSM/CDMA + 5G
  • Release Date : January 2021
  • Double SIM : No
  • Manufacturer Ref. : SM-G998U1
  • 5G : Yes
  • Verizon compatible : Yes
  • AT&T compatible : Yes
  • T-Mobile compatible : Yes
  • Release Year : 2021
  • Memory Card Slot : No
  • SAR head : 0.77
  • SAR body : 1.02
  • Dual SIM : Single-SIM + eSIM
  • SIM format : Nano
  • Brand : Samsung
  • Weight : 8 oz

Welcome to Back Market

The best prices for high-quality reborn tech by sellers we’ve checked and vetted. We don’t mind if you Google us .
Get to know us
Welcome to Back Market
  • Installment plans
  • Free 30-day returns
  • Free standard shipping
  • 1-year warranty
1 - 3
  • Current