Galaxy S21 5GGrey • 256 GB • Physical SIM + eSIM

(53 reviews)

A$351.00

Save A$1,018.00

GST inclusive*

Deals available

See limited deals and price drops

Free delivery by 4 - 5 Aug

Express shipping by 31 July - 3 Aug from A$7.00

Customer reviews for Galaxy S21 5G

Overall rating

53 verified reviews

Rating details

Battery
3.8/5
Shipping
4.1/5
Lens & Camera
4.2/5
Accessories
3.8/5
Packaging
4.1/5
Overall performance
4/5
Appearance
4.2/5

Reviews

Tim O.
Verified purchase
Reviewed 19/4/26, Australia.
The visible condition is like brand new. Nice to have the same model as before, but with higher gigs. Cable transfer from old to new did not work, but wireless did. I still have work to do transferring 2 factor authentications.
Galaxy S21 5G 128GB - White - Unlocked
Galaxy S21 5G 128GB - White - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
6/4/26
Nick G.
Verified purchase
Reviewed 30/10/24, Australia.
Pleasantly surprised it exceeded my expectations everything works the way it should the phone is immaculate and the delivery was prompt nothing to complain about will certainly be buying any future phones from you guys
Galaxy S21 5G 128GB - Gray - Unlocked
Galaxy S21 5G 128GB - Gray - Unlocked
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
21/10/24
Rebekah S.
Verified purchase
Reviewed 30/4/26, Australia.
Extremely happy. Postage was super quick & the phone is in perfect condition, it looks & runs like it's brand new.
Galaxy S21 5G 128GB - Purple - Unlocked
Galaxy S21 5G 128GB - Purple - Unlocked
Condition
Excellent
Almost no signs of wear. The body may have very light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
19/4/26
Steve B.
Verified purchase
Reviewed 13/4/25, Australia.
Great service, and a great phone too. Much better to get a quality refurbished phone than jumping on the "latest tech" bandwagon. Thanks guys! 👍👍
Galaxy S21 5G 256GB - Black - Unlocked
Galaxy S21 5G 256GB - Black - Unlocked
Condition
Excellent
Almost no signs of wear. The body may have very light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
26/3/25
Ebon Y.
Verified purchase
Reviewed 18/2/25, Australia.
Really happy. Great deal and have had for a couple of weeks and hasn't glitched or shown any signs of fault. Have had previous bad experiences with other second hand phones but not this one!. Absolute winner! Thanks heaps Back Market!
Galaxy S21 5G 128GB - Gray - Unlocked
Galaxy S21 5G 128GB - Gray - Unlocked
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
26/1/25
Craig K.
Verified purchase
Reviewed 12/3/25, Australia.
Hi, Samsung galaxy S21 is great phone, no scratches in great condition. Travelling soon for a long time, bit worried about having to charge it all the time, that's what happened to my Samsung galaxy S11.
Galaxy S21 5G 256GB - Grey - Unlocked
Galaxy S21 5G 256GB - Grey - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
18/2/25
Alychia S.
Verified purchase
Reviewed 6/8/24, Australia.
Brought a s21 for my daughter. Being the good condition option we were expecting a few scratches on the body and screen, to our surprise it was in perfect condition. The battery was dead when it first arrived which we liked so we could fully charge it right from the start. It holds battery well. She only has to charge it every second day and is on it quite a bit, as with any teenager. Delivery was also really quick. Came within two days of ordering. We will definitely be buying from here again for future phones and maybe other products.
Galaxy S21 5G 128GB - Gray - Unlocked
Galaxy S21 5G 128GB - Gray - Unlocked
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
28/7/24

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

Durability
Overall performance
Camera
Screen quality

UnlockedCarrier compatibility
Phantom GrayColor (official name)
12 megapixelsMain camera
SamsungBrand
Galaxy S21 5GModel
YesCompatible with latest Update
Physical SIM + eSIMSIM card
10 megapixelsFront camera
8 GBMemory (GB)

The Galaxy S21 5G is a flagship-level smartphone launched in 2021, offering a balance of performance and modern features. It is suitable for users who want a versatile device for everyday use, multimedia, and light gaming. As a pre-owned device, it provides an affordable way to access high-end technology.

Key features:

Model: Galaxy S21 5G
Display: 6.2-inch Dynamic AMOLED 2X, FHD+ resolution
Processor: Exynos 2100 (Global) or Snapdragon 888 (USA)
Camera: Triple rear cameras with 12MP wide, 64MP telephoto, and 12MP ultra-wide lenses
Connectivity: 5G compatible for fast data speeds

Who is this for?

The Galaxy S21 5G is ideal for tech-savvy users, students, or professionals seeking a high-performance device with a vibrant display and capable cameras. It’s suitable for those who want a premium experience without buying new.

Pros & Cons:

Pros	Cons
Vibrant AMOLED display with smooth 120Hz refresh rate	Battery life may vary depending on usage
Powerful Exynos/Snapdragon chipset	No headphone jack
5G connectivity for fast data speeds	Refurbished condition may show minor signs of use

Why refurbished?

Choosing a refurbished Galaxy S21 5G allows you to access a high-end smartphone at a more affordable price. Each device undergoes rigorous testing and quality checks to meet Back Market’s standards. Learn more about our quality standards.

Carrier compatibility: Unlocked
Color (official name): Phantom Gray
Main camera: 12 megapixels
Brand: Samsung
Model: Galaxy S21 5G
Compatible with latest Update: Yes
SIM card: Physical SIM + eSIM
Front camera: 10 megapixels
Memory (GB): 8 GB
Manufacturer version: SM-G991B
Serie: Samsung Galaxy S
Colour: Grey
Operating system: Android
Resolution: 1080 x 2400
Network: 5G
Release year: 2021
Weight: 169 oz
Storage: 256 GB
Screen type: Dynamic AMOLED 2X
Screen size (in): 6.2
Foldable: No

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

1-year warranty
Free standard shipping
Free 30-day returns
Friendly customer service

Choose location

Suggested searches

Popular searches

Galaxy S21 5GGrey • 256 GB • Physical SIM + eSIM

Galaxy S21 5GGrey • 256 GB • Physical SIM + eSIM

Comes with

Customer reviews for Galaxy S21 5G

Overall rating

Rating details

Reviews

Reviews

Tim O.

Nick G.

Rebekah S.

Steve B.

Ebon Y.

Craig K.

Alychia S.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

Some proof that refurbished electronics reduce the negative impact of tech on the planet | Back Market

How to factory reset an Android phone (4 quick scenarios) | Back Market

iPhone vs Android: which smartphone is right for you? | Back Market

From iPhone 17 to fridges: What to expect from Apple's September Keynote | Back Market

iPhone 18 vs iPhone 17 series: Comparing performance, price and how to choose the right model | Back Market

iPhone 17 series comparison: performance differences and which model should you choose? | Back Market

iPhone 17 Series Camera Comparison: How Does Each Model's Photography Stack Up? | Back Market

Welcome to Back Market