Realme C21 Smartphone Review with it’s All Features and Function

The Realme C series is well-known as a series that offers large batteries at affordable prices which is known to have successfully attracted smartphone users in its price range.

Well, the realme C21 itself is the C series with a large battery, three cameras and high quality, armed with certification from TUV Rheinland in the price range of one million.

This TUV Rheinland quality certification is the first time there is for an entry-level smartphone like the Realme C21. The vendor chose TUV Rheinland High Reliability certification because he wanted to set new quality standards in the entry level segment.

Not only that, to accommodate the needs of realme users in the beginner class segment, the C21 Realme is also supported by a camera and battery that can compete in its class.


Regarding design, the exterior of this smartphone is attractive considering that the C21 realme enters the entry level segment. Apart from having an eye-catching appearance, vendors are elevating the design sector on this smartphone to a higher level.

Realme and the quality testing team at TUV Rheinland work together to set new, improved quality standards for smartphones. TUV Rheinland has successfully set high quality standards for consumer electronics as well as industry standards for major markets worldwide.

According to TUV Rheinland’s new quality certification standard, most test conditions are based on the smartphone’s three-year life cycle.

TUV Rheinland conducts 23 tests covering 10 daily use scenarios including drop and abrasion due to use tests, then 7 extreme environmental scenarios such as super high and low temperature, high and low humidity, voltage fluctuation and static electricity.

Finally, there are 6 component testing scenarios such as the power and volume buttons and charger holes.

As a result, this affordable built quality smartphone can be transformed in such a way to be tough and premium. This C21 realme also has a camera module designed in the form of a box as well as a fingerprint sensor on the back.

It looks pleasing to the eye with a geometric design inspired by an hourglass, comfortable to hold and minimal fingerprints. The textured back is processed using the latest technology from Germany with a five-axis precision engraving machine that prevents scratches.

this series has three card slots (2 SIM + 1 microSD up to 256GB). It has a 3.5mm audio port on the bottom area and a microphone hole. Then the volume and power buttons are located in a row on the right side.

The latest design is presented by Realme C21 by placing speaker holes on the back of the body to produce a bigger sound output. It is said that according to a realme survey, this entry-level smartphone user needs a large sound output more.


This latest realme smartphone carries a 20: 9 mini drop screen with a span of 6.5 inches. This field of view is comfortable for playing games and watching videos. Moreover, the internal structure of the Realme C21 screen adopts a new arrangement process.

Realme creatively draws parts and components closer to each other resulting in reduced bangs area and delivers a screen ratio of up to 89.5% which has less visual distraction especially when watching multimedia content.

This series uses an IPS LCD panel with a resolution of 720 x 1600 pixels or so-called HD +. It is quite satisfying that we can enjoy a fairly sharp screen image display with optimal brightness.

Camera Setup

Realme C21 uses a main camera that adopts a 13MP image sensor with a large area. Supplied with a relatively large aperture of f / 2.2 to secure light and aid shooting in low light conditions.

this camera is backed up with PDAF which is able to capture focus more quickly and precisely. Then there is also the 4x zoom feature which also allows users to take clear photos from a distance.

Complementing the main sensor, there are B&W and Retro lenses providing two special artistic effects for portraits. Both lenses can reproduce portraits in black and white, providing high exposures and enhancing contrast.

As a complement, this C21 realme also deliberately brazed a macro lens with a super close shooting distance of 4cm. So that we can shoot macro photography with good detail. Not bad for exploring the charms of the micro world.

For selfie enthusiasts, there is a 5MP selfie camera on the front. Already supports AI beauty, HDR mode, portrait mode and the Panoselfie feature to help you take wider selfies.


This realme C21 is enhanced with the MediaTek Helio G35 chipset. Supported by an octa core core so that its performance is quite capable even though it is present for the entry level segment.

For those who are curious, the Mediatek Helio G35 is an eight-core processor with a 12nm fabrication capable of reaching a clock speed of 2.3 GHz, and adopting the Cortex A53 structure.

This processor is ideal for general users and gamers as it can handle most of the commonly used medium and heavy applications.

Convenient for playing the Mobile Legends game, you can still use high or high graphic settings. For PUBG Mobile, the graphics settings are just medium. Gameplay is still satisfying, there is no significant lag.

realme C21 will be available with 3GB + 32GB and 4GB + 64GB variants which are powered by LPDDR4X RAM. Compared to LPDDR3, graphics performance has increased by 20% and RAM performance has increased by 100%.

Android Version

realme UI based on Android 10, is better built closer to the pure Android interface. realme designed the UI keeping the preferences and aesthetics of young consumers in mind. The interface is smooth and efficient when used.

There are various features such as Dual Mode for sharing music, being able to connect a pair of wireless earbuds and wired earphones at the same time. There is a Focus Mode which can help you concentrate and relax, without being distracted from your phone.

Just use 3 fingers, press and hold on your screen then swipe to capture the selected part of the screen. There’s no need to cut anymore. Taking partial screenshots is done with just one step.

By enabling “Personal Information Protection” in realme UI, the system will provide a blank information page when the application requests to access the user’s personal information such as call history, contacts and messages.

Finally, there is a built-in Dark Mode which is neatly integrated in the realme UI. This mode is optimized to work in more third-party applications.

Even though it is an entry level product, the C21 realme supports an ultra-fast fingerprint sensor. Also supports facial recognition to make it easier to unlock with one click or one glance at the face.


It’s no secret that the battery plays an important role in today’s smartphones. People who have high mobility with as stable activities are likely to be suitable for the C21 reality.

The C21 realme that we tested had a 5000mAh battery. So, with a jumbo capacity like this, we can do outdoor activities all day without bothering to carry a charger.

In fact, this smartphone can become a power bank and help charge smartphones and other gadgets thanks to the OTG Reverse Charging feature. So besides being durable, the battery power can even be transferred to other devices.

Based on testing at Realme Lab, Realme C21 can last for 47 days in standby mode. Still about the battery, Realme also presents a Super Power Saving Mode.

In this mode, you can select 6 most used applications to stay active to extend a very long battery life.

When this mode is activated, the smartphone will automatically implement a more aggressive power saving strategy. According to realme’s research on user behavior, most people only use these 6 apps in 70-80% of all smartphone time.

So, we believe the super power saving mode greatly improves battery life but without sacrificing daily use.

Furthermore, the C21 realme relies on a 10W charger as a means of charging the battery. It takes about 3 hours to recharge the battery of the C21 realme.

Specifications Of Realme C21

Screen   6.5 inches (16.5cm) Fullscreen HD Resolution + 720 * 1600 Screen Ratio 89.5%
Processor   MediaTek Helio G3512nm Cortex A53 2.3Ghz production process
RAM & Internal Memory   3GB + 32GB 4GB + 64GB Storage capacity can be expanded up to 256GB
Color   Cross Black Cross Blue
Camera   13MP primary cameraf / 2.2 aperture 5P lensPDAF4x digital zoom
2MP B&W lensf / 2.4 aperture3P lensFF
2MP Macro lensf / 2.4 aperture3P lens4cm FF
Video720p / 1080p, 30fps
Front Camera AI 5MP f / 2.4 Aperture3P LensAI Beauty; HDR; Panoramic View; Timelapse
Connectivity   Supports 2.4G Wi-Fi, Supports Bluetooth 5.0
Size & Weight   Size: 165.2mm * 76.4mm * 8.9mm, Weight: 190g
Sensor   GPS / Beido / GlonassMagnetic Induction SensorLight SensorProximity SensorAccelerometer SensorFingerprint
Operating system   realme UI based on Android 10
Battery   5000mAh + Micro USB charging Supports OTG reverse charging

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