In depth comparison and review of Realme C21 and Fairphone 4. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.
| DESIGN AND DIMENSIONS | Realme C21 | Fairphone 4 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 162 mm | Realme C21 has greater height than Fairphone 4. |
| Width | 76.4 mm | 75.5 mm | Realme C21 has greater width than Fairphone 4. |
| Depth | 8.9 mm | 10.5 mm | Realme C21 is narrower than Realme C21. |
| Weight | 190 g | 225 g | Realme C21 is lighter than Realme C21. |
| Body Colour | Cross black | Cross blue | Grey | |
| Waterproof (Water-resistant) | - | - | |
| IP rating | - | IP54 | |
| SAR Value | - | 0.494 W/kg (head), 0.993 W/kg (body), 2.916 W/kg (limb) | |
| Connector Type | Micro-USB Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | Fairphone 4 |
|---|
| Display Type | LCD display | LCD display | |
|---|---|---|---|
| Display Technology | LCD | IPS | |
| Screen Size (Display Size) | 6.5" | 6.3" | Realme C21 has larger screen size than Fairphone 4. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 2340 x 1080 pixels | Fairphone 4 has better screen resolution than Realme C21. |
| Display Format | HD+ | Full HD+ | |
| Pixel Density | - | 410 ppi | |
| Aspect Ratio | 20:9 | 19.5:9 | |
| Max Brightness | 420 cd/m² | - | |
| Colour Depth | - | 16.7 million colours | |
| Display Features | Mini-drop display | Full Lamination, Pixelworks technology | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass 5 (scratch resistant glass) |
| PROCESSOR | Realme C21 | Fairphone 4 |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | Qualcomm Snapdragon 750G | |
|---|---|---|---|
| Processor Number | - | SM7225 | |
| Clock Speed | 2.3 GHz | 2.2 GHz | Realme C21 has higher clock speed than Fairphone 4. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | PowerVR GE8320 | Qualcomm ADRENO 619 |
| MEMORY | Realme C21 | Fairphone 4 |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | 6 GB | Fairphone 4 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 128 GB | Fairphone 4 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | microSD | microSDHC, microSD, microSDXC - up to 2 TB |
| CAMERA | Realme C21 | Fairphone 4 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 2 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 48 Megapixel | Fairphone 4 has better camera resolution than Realme C21. |
| Sensor Size | - | 1/2" | |
| Sensor Name | - | Sony Exmor RS IMX582 sensor | |
| Lens Aperture | F/2.2 | F/1.6 | Fairphone 4 has better lens aperture than Realme C21. |
| Lens Construction | 5-element | - | |
| Pixel Size | - | 0.8 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Fairphone 4 has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | 4x | 8x | Fairphone 4 has better digital zoom than Realme C21. |
| Special Effects | HDR | HDR | |
| Camera Modes | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | Slow motion video, Pro mode, night mode | |
| Light Source | LED flash | Dual LED flash | |
| Still Image Resolutions | - | 8000 x 6000 | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 3840 x 2160 (4K) at 30 fps, 4000 x 3000 (4K UHD) | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | Laser detection auto focus (LDAF), TOF sensor, colour sensor |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | 48 Megapixel | Fairphone 4 has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.4 | F/2.2 | Fairphone 4 has better second camera lens aperture than Realme C21. |
| Lens Element Qty (2nd Camera) | 3-element | - | |
| Field of View (2nd Camera) | - | 120 degree(s) | |
| Pixel Size (2nd Camera) | - | 0.8 μm | |
| Camera Functions (2nd Camera) | B&W lens | Macro focus | |
| Still Image Resolutions | - | 8000 x 6000 |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Lens Element Qty (3rd Camera) | 3-element | - | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | 4cm macro photography | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 25 Megapixel | Fairphone 4 has better front camera resolution than Realme C21. |
| Sensor Size (Front) | - | 1/2.78" | |
| Sensor Name (Front) | - | Sony Exmor RS IMX576 sensor | |
| Lens Aperture (Front) | F/2.2 | F/2.2 | Both phones have the same front camera lens aperture. |
| Lens Element Qty (Front) | 3-element | - | |
| Focus Adjustment | - | Focus free | |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | - | |
| Face Recognition (Face ID) | Face recognition | - | Realme C21 has face detection. |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Front) | - | Up to 8x digital zoom, digital image stabilisation, ToF sensor, colour sensor |
| BATTERY AND CHARGING | Realme C21 | Fairphone 4 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 3905 mAh | Realme C21 has larger battery capacity than Fairphone 4. |
|---|---|---|---|
| Standby Time | - | 200 hours | |
| Talk Time | - | 780 minutes | |
| Run Time Details | - | Talk: up to 780 min Standby: up to 200 hrs |
|
| Battery Technology | - | Lithium Ion |
| CELLULAR | Realme C21 | Fairphone 4 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | Fairphone 4 has more advanced generation mobile network. |
| Operating System | Android 10 | Android 11 | |
| User Interface | Realme UI | - | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, A-GPS, GLONASS, BeiDou, Galileo, GNSS |
| COMMUNICATIONS | Realme C21 | Fairphone 4 |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, VoLTE, VoWiFi, 5G NR | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 5, Band 8 | Band 1, Band 2, Band 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 850, 900 | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 18, Band 19, Band 20, Band 28, Band 32, Band 38, Band 40, Band 41, Band 71 | |
| 4G LTE Frequency | FDD 2100, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 2300, TDD 2500, FDD 600 | |
| 5G NR Band | - | N1, n3, n5, n7, n8, n20, n28, n38, n41, n71, n77, n78 | |
| 5G NR Frequency | - | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD 600, TDD TD 3700, TDD TD 3500 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.1 LE | |
| NFC | - | Yes | Fairphone 4 has NFC reader for mobile payments. |
| MEDIA | Realme C21 | Fairphone 4 |
|---|
| Supported Digital Audio Standards | - | WAV, AAC, AIFF, MP3, FLAC, AAC +, eAAC+, ALAC, OPUS, AMR-WB, AMR-NB, Vorbis, AAC-ELD | |
|---|---|---|---|
| Supported Digital Video Standards | - | XviD, DivX, MPEG-2, H.264, H.263, HEVC, VP9 |
| FEATURES | Realme C21 | Fairphone 4 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, magnetometer, light sensor | Accelerometer, ambient light sensor, proximity sensor, digital compass, gyro sensor | |
| Security Devices | Fingerprint reader | Fingerprint reader (side) | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | MIMO technology, modular and repairable design, recycled and fair materials |
| OTHERS | Realme C21 | Fairphone 4 |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | - | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | MIL-STD 810G, IP54 |
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