Product
Vivo V21
Vivo V21
Samsung Galaxy M55s
Samsung Galaxy M55s
Battery
Charging 33W wired, 63% in 30 min 45W wired
Type 4000 mAh 5000 mAh
Body
Build Glass front, plastic frame, plastic back -
Dimensions 159.7 x 73.9 x 7.3 mm (6.29 x 2.91 x 0.29 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 176 g (6.21 oz) 180 g (6.35 oz)
Comms
Bluetooth 5.1, A2DP, LE 5.2, A2DP, LE
NFC No Yes
Positioning GPS, GLONASS, GALILEO, BDS 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
Resolution 1080 x 2400 pixels, 20:9 ratio (~409 ppi density) 1080 x 2400 pixels, 20:9 ratio (~393 ppi density)
Size 6.44 inches, 100.1 cm2 (~84.8% screen-to-body ratio) 6.7 inches, 108.4 cm2 (~86.4% screen-to-body ratio)
Type AMOLED, 90Hz, HDR10+, 500 nits (typ) 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 2021, April 27 2024, September 24
Status Available. Released 2021, May 05 Available. Released 2024, September 26
Main Camera
Features LED flash, HDR, panorama LED flash, panorama, HDR
Triple 64 MP, f/1.8, 26mm (wide), 1/1.72", 0.8µm, PDAF, OIS 8 MP, f/2.2, 120˚, 16mm (ultrawide), 1/4.0", 1.12µm 2 MP, f/2.4, (macro) 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 4K@30fps (no OIS), 1080p@30/60fps 4K@30fps, 1080p@30/60fps, gyro-EIS, OIS
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (uses shared SIM slot)
Internal 128GB 8GB RAM, 256GB 8GB RAM 128GB 8GB RAM, 256GB 8GB RAM
  UFS 2.2 -
Misc
Colors Dusk Blue, Sunset Dazzle Thunder Black, Coral Green
Models V2066, V2108 SM-M558B, SM-M558B/DS
SAR - 0.93 W/kg (head)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 39, 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 123h -
Display Contrast ratio: Infinite (nominal) -
Loudspeaker -28.2 LUFS (Average) -
Performance AnTuTu: 336699 (v8), 365055 (v9) GeekBench: 6516 (v4.4), 1600 (v5.1) GFXBench: 17fps (ES 3.1 onscreen) -
Platform
Chipset Mediatek Dimensity 800U (7 nm) Qualcomm SM7450-AB Snapdragon 7 Gen 1 (4 nm)
CPU Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55) Octa-core (1x2.4 GHz Cortex-A710 & 3x2.36 GHz Cortex-A710 & 4x1.8 GHz Cortex-A510)
GPU Mali-G57 MC3 Adreno 644
OS Android 11, Funtouch 11.1 Android 14, up to 4 major Android upgrades, One UI 6.1
Selfie camera
Features Dual-LED flash, HDR -
Single 44 MP, f/2.0, (wide), AF, OIS 50 MP, f/2.4, (wide)
Video 4K@30fps (no OIS), 1080p@30fps 4K@30fps, 1080p@30/60fps
Sound
3.5mm jack No No
Loudspeaker Yes Yes, with stereo speakers