Product
Oppo F21 Pro
Oppo F21 Pro
Samsung Galaxy F55
Samsung Galaxy F55
Battery
Charging 33W wired, 100% in 60 min Reverse wired 45W wired
Type Li-Po 4500 mAh 5000 mAh
Body
Build - Glass front, silicone polymer (eco leather) back, plastic frame
Dimensions 159.9 x 73.2 x 7.5 mm (6.30 x 2.88 x 0.30 in) 163.9 x 76.5 x 7.8 mm (6.45 x 3.01 x 0.31 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 175 g (6.17 oz) 180 g (6.35 oz)
  IPX4 water resistant RGB ring light around the camera (notifications, charging progress) -
Comms
Bluetooth 5.1, A2DP, LE, aptX HD 5.2, A2DP, LE
NFC No Yes
Positioning GPS, GLONASS, BDS, GALILEO, QZSS GPS, GALILEO, GLONASS, BDS, QZSS
Radio No No
USB USB Type-C 2.0, OTG USB Type-C 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Display
Protection Corning Gorilla Glass 5 -
Resolution 1080 x 2400 pixels, 20:9 ratio (~409 ppi density) 1080 x 2400 pixels, 20:9 ratio (~393 ppi density)
Size 6.43 inches, 99.8 cm2 (~85.3% screen-to-body ratio) 6.7 inches, 108.4 cm2 (~86.4% screen-to-body ratio)
Type AMOLED, 90Hz, 430 nits (typ), 600 nits (HBM), 800 nits (peak) Super AMOLED+, 120Hz, 1000 nits (HBM)
Features
Sensors Fingerprint (under display, optical), accelerometer, gyro, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2022, April 12 2024, May 17
Status Available. Released 2022, April 15 Available. Released 2024, May 27
Main Camera
Features LED flash, HDR, panorama LED flash, panorama, HDR
Triple 64 MP, f/1.7, 26mm (wide), 1/2.0", 0.7µm, PDAF 2 MP, f/3.3, (microscope) 2 MP, f/2.4, (depth) 50 MP, f/1.8, (wide), 1/1.56", 1.0µm, PDAF, OIS 8 MP, f/2.2, 123˚ (ultrawide) 2 MP, f/2.4, (macro)
Video 1080p@30fps, gyro-EIS 4K@30fps, 1080p@30/60fps, gyro-EIS, OIS
Memory
Card slot microSDXC microSDXC (uses shared SIM slot)
Internal 128GB 8GB RAM 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
  UFS 2.2 -
Misc
Colors Cosmic Black, Sunset Orange, Dawnlight Gold, Starlight Black Black, Apricot
Models CPH2363, CPH2461 SM-E556B/DS, SM-E556B
SAR - 0.93 W/kg (head)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 3, 5, 8, 38, 40, 41 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 25, 26, 28, 38, 40, 41, 66
5G bands - 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6
Speed HSPA, LTE HSPA, LTE, 5G
Technology GSM / HSPA / LTE GSM / HSPA / LTE / 5G
Our Tests
Battery (old) Endurance rating 127h -
Display Contrast ratio: Infinite (nominal) -
Loudspeaker -29.7 LUFS (Average) -
Performance AnTuTu: 289250 (v9) GeekBench: 1653 (v5.1) GFXBench: 7.2fps (ES 3.1 onscreen) -
Platform
Chipset Qualcomm SM6225 Snapdragon 680 4G (6 nm) Qualcomm SM7450-AB Snapdragon 7 Gen 1 (4 nm)
CPU Octa-core (4x2.4 GHz Kryo 265 Gold & 4x1.9 GHz Kryo 265 Silver) Octa-core (1x2.4 GHz Cortex-A710 & 3x2.36 GHz Cortex-A710 & 4x1.8 GHz Cortex-A510)
GPU Adreno 610 Adreno 644
OS Android 12, upgradable to Android 14, ColorOS 14 Android 14, upgradable to Android 15, One UI 7
Selfie camera
Features Panorama, HDR -
Single 32 MP, f/2.4, 24mm (wide), 1/2.74", 0.8µm 50 MP, f/2.4, (wide)
Video 1080p@30fps, gyro-EIS 4K@30fps, 1080p@30/60fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes, with stereo speakers