Realme C21Black • 64 GB • Dual Physical SIM

Name: Realme C21 64GB - Black - Unlocked
Brand: Realme
Price: 189.00 GBP
Availability: InStock
Rating: 4.16 (24 reviews)

(24 reviews)

£189.00

before trade-in

Free delivery by 19 - 20 Aug

Express delivery by 17-18 Aug from £5.00

Restored professionally

Based on up to 100-points of inspection

Select the condition

All guaranteed 100% functional

Select the condition

Fair Sold out
Good Sold out
Excellent £189.00
Popular
Premium Sold out

Select storage

Select storage

64 GB £189.00

Select the colour

Black £189.00

Realme C21

Excellent
64 GB
Black

£189.00

before trade-in

applies (starting at £0.49)

Proudly refurbished by Ontronics Ltd

Free delivery by 19 - 20 Aug

Express delivery by 17-18 Aug from £5.00

Comes with

Compatible charging cable

Often bought together

Realme C21

Black • 64 GB • Dual Physical SIM

Refurbished price:£189.00

Versus £190.00 new

AirPods Pro 2 (2024)

Refurbished price:£149.00

Total price: £338.00

These items might be sold and delivered by different sellers.

Customer reviews for Realme C21

Overall rating

24 verified reviews

Rating details

Accessories
4.2/5
Appearance
4.2/5
Battery
4.3/5
Lens & Camera
3.8/5
Overall performance
4/5
Packaging
4.3/5
Shipping
4/5

Reviews

David W.
Verified purchase
Reviewed 13/10/2022, United Kingdom.
.
Realme C21 32GB - Blue - Unlocked - Dual-SIM
Realme C21 32GB - Blue - Unlocked - Dual-SIM
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
11/10/2022
Betty S.
Verified purchase
Reviewed 24/11/2024, France.
Very good 👍
Translated from French
Realme C21 64 Go - Noir - Débloqué
Realme C21 64 Go - Noir - Débloqué
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
09/11/2024
Ελενη Ρ.
Verified purchase
Reviewed 30/04/2026, Greece.
Realme C21 64GB - Μαύρο - Ξεκλείδωτο
Realme C21 64GB - Μαύρο - Ξεκλείδωτο
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
16/04/2026
Cécile H.
Verified purchase
Reviewed 04/12/2021, France.
Phone bought for a teenager, perfect for her. The best thing for me is that it is compatible with google. The quality is there as always, delivery is fast. I highly recommend it.
Translated from French
Realme C21 32 Go - Noir - Débloqué
Realme C21 32 Go - Noir - Débloqué
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
17/11/2021
Pablo C.
Verified purchase
Reviewed 01/09/2022, Spain.
Very fast delivery, perfect condition of the phone, a 10 to the seller. It is the second time I order in backmarket and everything perfect, no doubt I will repeat.
Translated from Spanish
Realme C21 64GB - Negro - Libre - Dual-SIM
Realme C21 64GB - Negro - Libre - Dual-SIM
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
18/08/2022
Raquel R.
Verified purchase
Reviewed 06/01/2022, Spain.
The product is perfect, the delivery was very fast and there was a communication failure, I was not notified in time when the order was going to arrive and I had to go to the delivery office to pick it up, but really, no problem.
Translated from Spanish
Realme C21 64GB - Azul - Libre - Dual-SIM
Realme C21 64GB - Azul - Libre - Dual-SIM
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
31/12/2021
Yolande G.
Verified purchase
Reviewed 22/02/2023, France.
Excellent for the price! Almost (if not) brand new product!
Translated from French
Realme C21 32 Go Dual Sim - Bleu - Débloqué
Realme C21 32 Go Dual Sim - Bleu - Débloqué
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
09/02/2023

Everything you ever wanted to know about the Realme C21

Durability
Overall performance
Camera
Screen quality

RealmeBrand
190 gWeight
4 GBMemory (GB)
microSDXCSD Card Slot
IPS LCDScreen type
UnlockedCarrier compatibility
Dual Physical SIMSIM card
Cross BlackColour (official name)
5 megapixelsFront camera

The Realme C21 is a practical smartphone designed for users seeking reliable performance without unnecessary frills. Launched in March 2021, this device features a solid build and essential functionalities, making it suitable for everyday tasks.

Key features:

Release Date: March 2021
Display: 6.5-inch IPS LCD, HD+ resolution
Processor: MediaTek Helio G35
Camera: Triple rear cameras with a 13MP main sensor
Connectivity: 4G LTE support for reliable mobile data.

Who is this for?

The Realme C21 is ideal for students, first-time smartphone users, or anyone needing a straightforward device for calls, messaging, and light app usage. It’s a practical choice for those who don’t require high-end specifications but still want a dependable smartphone experience.

Pros & Cons:

Pros	Cons
Large display for media consumption.	Limited performance for heavy multitasking or gaming.
Decent camera for everyday photography.	Basic design may not appeal to all users.

Why refurbished?

Choosing a refurbished Realme C21 allows you to enjoy a functional smartphone while being eco-conscious. Back Market ensures each device undergoes thorough testing to meet quality standards, providing peace of mind for your purchase. Learn more about our quality standards.

Brand: Realme
Weight: 190 g
Memory (GB): 4 GB
SD Card Slot: microSDXC
Screen type: IPS LCD
Carrier compatibility: Unlocked
SIM card: Dual Physical SIM
Colour (official name): Cross Black
Front camera: 5 megapixels
Mobile network: 4G
SAR head: N/A
Resolution: 720 x 1600
Storage: 64 GB
Year of Release: 2021
Screen size (in): 6,5
Main camera: 13 megapixels
Model: Realme C21
Foldable: No
Colour: Black
OS: Android
Manufacturer Ref: RMX3201
Compatible with latest Update: No

Welcome to Back Market

The best prices for high-quality renewed goods by sellers we’ve checked and vetted. We don’t mind if you Google us.

Get to know us

1-year minimum warranty
Free delivery on all items
Free 30-day returns
Excellent customer support

Choose location

Suggested searches

Popular searches

Realme C21Black • 64 GB • Dual Physical SIM

Realme C21Black • 64 GB • Dual Physical SIM

Restored professionally

Comes with

Often bought together

Customer reviews for Realme C21

Overall rating

Rating details

Reviews

Reviews

David W.

Betty S.

Ελενη Ρ.

Cécile H.

Pablo C.

Raquel R.

Yolande G.

Popular searches

Everything you ever wanted to know about the Realme C21

Durability

Overall performance

Camera

Screen quality

Related articles

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

Buying your teen's first phone? Here’s how to keep them safe | Back Market

I swapped my smartphone for a dumbphone for a week and was surprised by the result | Back Market

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

Childhood is too short to be spent on a smartphone | Back Market

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

H1: Best smartwatch for Android: The only guide you need | Back Market

Welcome to Back Market