Galaxy S21 5G 256GB - Grey - Unlocked

Customer reviews for Galaxy S21 5G

Overall rating

19,043 verified reviews

Rating details

Accessories
4.1/5
Appearance
4.5/5
Battery
4/5
Lens & Camera
4.5/5
Overall performance
4.2/5
Packaging
4.5/5
Shipping
4.6/5

Reviews

Fiona M.
Verified purchase
Reviewed 10/02/2025, Ireland.
I can noy fault my experience with Back Market. I ordered the phone at 8.30 am on thursday and it was delivered to Ireland by 12pm on the Friday, the next day. The phone is perfect. Amazing quality. I will definitely buy more.
Galaxy S21 5G 256GB - Purple - Unlocked
Galaxy S21 5G 256GB - 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
30/01/2025
Liam D.
Verified purchase
Reviewed 12/08/2024, Ireland.
Excellent all around. Site was easy to use and kept me informed of postal delivery etc. I got two o hones and they are both excellent. The description was right on the mark and I will be definitely using thus site again.
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - 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
29/07/2024
Anne H.
Verified purchase
Reviewed 10/09/2023, Ireland.
I love my new phone, it really does feel brand new. Being able to go sim only will halve my phone bill. The whole process was very easy, have recommended Back Market to several people already. No more massive bills, delighted
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
26/08/2023
John M.
Verified purchase
Reviewed 01/10/2025, Ireland.
Great, it arrived on time and was simple to transfer all the data across ftom my old mobile to my new one.
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - 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
10/09/2025
James F.
Verified purchase
Reviewed 15/12/2024, Ireland.
I'm very happy with my purchase it's in mint condition and working perfectly. I would recommend Back Market to anyone
Galaxy S21 5G 128GB - Purple - Unlocked
Galaxy S21 5G 128GB - Purple - Unlocked
Condition
Premium
Close to perfection. The body may have tiny micro-scratches. For items with screens, the screen will be flawless.
Purchased
25/11/2024
Conor F.
Verified purchase
Reviewed 09/08/2023, Ireland.
First time buying a refurbished phone and will continue to by refurbished. . . . . . I have been using the phone for a while now and it is next to new, I am very happy with it and I will be consulting Back Market should I need any other devices. I would highly recommend!
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - 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
26/07/2023
Ciara C.
Verified purchase
Reviewed 08/09/2025, Ireland.
Paid for a premium refurbished unlocked phone. When the phone came it was locked to another network. I had to return the phone leaving me with no phone for some days. I was not impressed. Will not use this site again.
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - 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
27/08/2025

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

Durability
Overall performance
Camera
Screen quality

YesCompatible with latest Update
169 gWeight
Galaxy S21 5GModel
Phantom GrayColor (official name)
NoSD Card Slot
Physical SIM + eSIMSIM card
1080 x 2400Resolution
5GNetwork
UnlockedCarrier compatibility

The Samsung Galaxy S21 5G is a flagship smartphone that combines cutting-edge technology with a sleek design. Launched in January 2021, this model remains a strong contender in the market, offering a powerful performance and impressive camera capabilities.

Key features:

Release Date: January 2021
Display: 6.2-inch Dynamic AMOLED 2X, FHD+ resolution
Processor: Exynos 2100 (International) / Snapdragon 888 (USA)
Camera: Triple rear cameras with 12MP ultra-wide, 12MP wide, and 64MP telephoto lenses
Connectivity: 5G compatible ensuring ultra-fast downloads and low-latency performance.

Who is this for?

The Samsung Galaxy S21 5G is ideal for users who want a high-performing smartphone with excellent photography capabilities. It's well-suited for professionals, content creators, and anyone who enjoys streaming media on a vibrant display.

Pros & Cons: Pros Cons Stunning display with vibrant colours and high refresh rate. No expandable storage option available. Versatile camera system for various photography styles. Plastic back may not appeal to all users.
Why refurbished?

Choosing a refurbished Samsung Galaxy S21 5G allows you to enjoy premium features while being eco-conscious. Back Market ensures each device undergoes thorough testing and meets high-quality standards. Learn more about our quality standards.

Compatible with latest Update: Yes
Weight: 169 g
Model: Galaxy S21 5G
Color (official name): Phantom Gray
SD Card Slot: No
SIM card: Physical SIM + eSIM
Resolution: 1080 x 2400
Network: 5G
Carrier compatibility: Unlocked
OS: Android
Foldable: No
Main camera: 12 megapixels
Screen type: Dynamic AMOLED 2X
Serie: Samsung Galaxy S
Storage: 256 GB
Colour: Grey
Front camera: 10 megapixels
Memory (GB): 8 GB
SAR head: 0.46
Year of Release: 2021
Brand: Samsung
Manufacturer Ref: SM-G991B
Screen size (in): 6.2
SAR body part: 1.51

Samsung Tab

Choose location

Suggested searches

Popular searches

Galaxy S21 5G 256GB - Grey - Unlocked

Customer reviews for Galaxy S21 5G

Overall rating

Rating details

Reviews

Reviews

Fiona M.

Liam D.

Anne H.

John M.

James F.

Conor F.

Ciara C.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

Is the Samsung S9 still a good phone to buy? | Back Market

Samsung Galaxy S23 review: display, design, performance and camera specs | Back Market

Samsung Galaxy S22: Price, Release Date and Technical Specifications | Back Market

The best Samsung phone in 2025 | Back Market

Samsung S10e review – Retro Cool or Just Old? | Back Market

Our review of the Samsung Galaxy A71 | Back Market

Samsung Galaxy Tab S9 series first look review: which one should you get? | Back Market

Welcome to Back Market