Realme C21

Last updated
realme C21
realme C21Y
Brand realme
Type Phablet
SeriesC
First releasedC21: March 5, 2021;4 years ago (2021-03-05)
C21Y: June 21, 2021;4 years ago (2021-06-21)
Predecessor Realme C11
Successor Realme C31
Related Realme C20
Realme C25
Compatible networks GSM, 3G, 4G (LTE)
Form factor Slate
ColorsCross Black & Cross Blue
DimensionsC21: 165.2 × 76.4 × 8.9 mm
C21Y: 164.5 × 76 × 9.1 mm
WeightC21: 190 g
C21Y: 200 g
Operating system C21:
Original: Android 10 + realme UI 1
Current: Android 11 + realme UI 2
C21Y:
Original: Android 11 + realme R Edition
CPU C21: MediaTek MT6762 Helio G35 (12 nm), 8 cores (4×2.3 GHz Cortex-A53 & 4×1.8 GHz Cortex-A53)
C21Y: Unisoc T610 (12 nm), 8 cores (2×1.8 GHz Cortex-A75 & 6×1.8 GHz Cortex-A53)
GPU C21: PowerVR GE8320
C21Y: Mali-G52
Memory3/4 GB LPDDR4X
Storage32/64 GB eMMC 5.1
Removable storage MicroSDXC up to 256 GB
BatteryNon-removable, Li-Po 5000 mAh
Charging10 W, reverse charging
Rear camera13 MP, f/2.2 (wide-angle), 1/3.06", 1.12 µm, PDAF + 2 MP, f/2.4, (macro) + 2 MP, f/2.4, (depth sensor)
LED flash, HDR, panorama
Video: 1080p@30fps
Front camera 5 MP, f/2.2 (wide-angle), 1/5.0", 1.12 µm
HDR, panorama
Video: 1080p@30fps
Display IPS LCD, 6.5", 1600 × 720 (HD+), 20:9, 270 ppi
Connectivity microUSB 2.0, 3.5 mm Audio, Bluetooth 5.0 (A2DP, LE), FM radio, Wi-Fi 802.11 b/g/n (hotspot), GPS, A-GPS, GLONASS, BDS
Data inputsRear-mounted fingerprint scanner, accelerometer, proximity sensor, compass
References [1] [2]

The realme C21 is an entry-level smartphone developed and manufactured by realme. It was introduced on March 5, 2021. [3] Also on June 21 of the same year, the realme C21Y was introduced, featuring a more powerful processor and a design similar to the realme C11. [4]

Contents

Design

The screen is made of glass. The body is made of plastic and has a special texture.

On the bottom, there is a microUSB port, a microphone, and a 3.5 mm audio jack. On the left side of the smartphone, there is a slot for 2 SIM cards and a microSD card up to 256 GB. On the right side are the volume buttons and the power button. On the back, there is the main camera module with an LED flash, a fingerprint scanner, and the main speaker.

The smartphones were sold in Cross Black (Black) and Cross Blue (Blue) colors.

Technical specifications

Platform

The realme C21 utilises the MediaTek Helio G35 processor and the PowerVR GE8320 GPU. [5]

The realme C21Y utilises the Unisoc T610 processor and the Mali-G52 GPU.

Battery

Both smartphones utilise the battery capacity of 5000 mAh. The smartphones also have support for reverse wired charging. [6]

Camera

The smartphones feature a triple rear camera setup: 13 MP, f/2.2 (wide-angle) + 2 MP, f/2.4 (macro) + 2 MP, f/2.4 (depth sensor) with phase-detection autofocus and the ability to record video at 1080p@30fps. The front camera has a 5 MP resolution, an f/2.2 aperture (wide-angle), and is capable of recording video at 1080p@30fps.

Display

Both smartphone have a 6.5-inch IPS LCD with 720 x 1600 HD+ resolution and an aspect ratio of 20:9, a pixel density of 270 ppi, and a waterdrop notch for the front camera. However, in outdoor conditions, the brightness is too low. [7]

Memory

The smartphones were available in 3/32 GB and 4/64 GB configurations.

Software

The realme C21 was released with realme UI 1 based on Android 10 and was later updated to realme UI 2 based on Android 11.

The realme C21Y was released with realme UI R Edition (a simplified version of realme UI) based on Android 11.

References

  1. ↑ "Realme C21 - Full phone specifications". www.gsmarena.com. Archived from the original on May 16, 2021. Retrieved 2021-07-03.
  2. ↑ "Realme C21Y - Full phone specifications". www.gsmarena.com. Archived from the original on July 2, 2021. Retrieved 2021-07-03.
  3. ↑ "Realme C21 announced with Helio G35 SoC, triple camera, and 5,000 mAh battery". GSMArena.com. Archived from the original on 2021-07-09. Retrieved 2026-01-25.
  4. ↑ "Ultra-cheap Realme C21Y with Unisoc T610 chipset goes on sale". GSMArena.com. Archived from the original on 2021-07-02. Retrieved 2026-01-25.
  5. ↑ "Обзор бюджетного смартфона Realme C21 с поддержкой NFC". iXBT.com (in Russian). Archived from the original on 2021-07-09. Retrieved 2026-01-25.
  6. ↑ "Mobile-review.com Ход королевы. Realme C21 (NFC 4/64 ГБ) за 9 990 рублей меняет правила игры". mobile-review.com (in Russian). Archived from the original on 2021-07-09. Retrieved 2026-01-25.
  7. ↑ DXOMARK (2021-09-23). "Realme C21 Display review: Sticking to the basics". DXOMARK. Retrieved 2026-01-25.
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