Galaxy S21 5GGrey • 128 GB • Dual Physical SIM + eSIM

(19,209 reviews)

€205.00

Save €654.00

Free delivery by 13 - 14 Aug

Restored professionally

Based on up to 100 points of inspection

Customer reviews for Galaxy S21 5G

Overall rating

19,209 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
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
Elioth N.
Verified purchase
Reviewed 15/06/2025, Ireland.
Livraison extrêmement rapide (le lendemain de ma commande) et tout à fait satisfaisante. Plusieurs années que je commande sur BackMarket, je n'ai jamais été déçu !
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
02/06/2025
Jethro K.
Verified purchase
Reviewed 17/02/2025, Ireland.
Quick delivery. Item in excellent condition and working perfectly so far. Very satisfied with the item
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
03/02/2025
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

USB-CConnector
Dual Physical SIM + eSIMSIM card
Galaxy S21 5GModel
8 GBMemory (GB)
0,79 cmDepth
6.2Screen size (in)
128 GBStorage
SamsungBrand
15,17 cmHeight

The Galaxy S21 5G is a powerful smartphone that combines cutting-edge technology with a sleek design. Released in January 2021, this device remains a strong contender in the smartphone market, offering 5G connectivity 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-camera system with 12MP ultra-wide, 12MP wide, and 64MP telephoto lenses
Connectivity: 5G compatible for ultra-fast downloads and low-latency performance.

Who is this for?

The Galaxy S21 5G is ideal for users looking for a high-performance smartphone with excellent camera features. It suits students, professionals, and anyone who enjoys capturing high-quality photos and videos while staying connected with the latest technology.

Pros & Cons:

Pros	Cons
Vibrant display with 120Hz refresh rate.	No expandable storage option.
Versatile camera system for various photography styles.	Plastic back may feel less premium than glass alternatives.

Why refurbished?

Choosing a refurbished Galaxy S21 5G allows you to enjoy a top-tier smartphone while being eco-conscious. Each device is thoroughly inspected and tested to meet Back Market’s quality standards, ensuring reliability. Scopri di più sui nostri standard di qualità.

Connector: USB-C
SIM card: Dual Physical SIM + eSIM
Model: Galaxy S21 5G
Memory (GB): 8 GB
Depth: 0,79 cm
Screen size (in): 6.2
Storage: 128 GB
Brand: Samsung
Height: 15,17 cm
Color (official name): Phantom gray
SAR body: 1,509
Main camera: 12 megapixels
Compatible with latest Update: Yes
Network: 5G
Year of Release: 2021
OS: Android
Resolution: 1080 x 2400
Width: 7,12 cm
SD Card Slot: No
Foldable: No
Screen type: Dynamic AMOLED 2X
Weight: 169 g
Serie: Samsung Galaxy S
SAR head: 0,456
Front camera: 10 megapixels
Manufacturer Ref: SM-G991B/DS
Colour: Grey
Camera Type: Triple (3x)
Carrier compatibility: Unlocked

Choose location

Suggested searches

Popular searches

Galaxy S21 5GGrey • 128 GB • Dual Physical SIM + eSIM

Galaxy S21 5GGrey • 128 GB • Dual Physical SIM + eSIM

Restored professionally

Comes with

Often bought together

Customer reviews for Galaxy S21 5G

Overall rating

Rating details

Reviews

Reviews

Fiona M.

Liam D.

John M.

James F.

Elioth N.

Jethro K.

Ciara C.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

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

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

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

Our review of the Samsung Galaxy A71 | Back Market

The best Samsung phone in 2025 | Back Market

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

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

Welcome to Back Market