Product
Vivo X21i
Vivo X21i
Vivo X27 Pro
Vivo X27 Pro
Battery
Charging 18W wired 18W wired
Type Li-Ion 3425 mAh, non-removable 4000 mAh, non-removable
Body
Dimensions 154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in) 165.7 x 74.6 x 9 mm (6.52 x 2.94 x 0.35 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 159 g (5.61 oz) 200 g (7.05 oz)
Comms
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE, EDR, aptX
NFC No Yes
Positioning GPS, GLONASS GPS, GLONASS, BDS
Radio FM radio No
USB microUSB 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, dual-band, Wi-Fi Direct
Display
Resolution 1080 x 2280 pixels, 19:9 ratio (~402 ppi density) 1080 x 2460 pixels (~401 ppi density)
Size 6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio) 6.7 inches, 106.6 cm2 (~86.2% screen-to-body ratio)
Type Super AMOLED Super AMOLED
Features
Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2018, May. Released 2018, May 2019, April. Released 2019, April
Status Discontinued Discontinued
Main Camera
Dual 12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF 5 MP, f/2.4, (depth) -
Features LED flash, HDR, panorama LED flash, HDR, panorama
Triple - 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF 13 MP, f/2.2, 13mm (ultrawide) 2 MP, f/2.4, (depth)
Video 1080p@30fps 4K@30fps, 1080p@30/60fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 64GB 6GB RAM, 128GB 4GB RAM 256GB 8GB RAM
  eMMC 5.1 -
Misc
Colors Black, Aurora White, Ruby Red, Night Purple Black, White
Models X21i A V1836A, V1836T, V1838T
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, 4, 5, 8, 38, 39, 40, 41 1, 2, 3, 4, 5, 8, 34, 38, 39, 40, 41 - V1836A
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE (2CA) Cat12 600/50 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / LTE
  CDMA 800 & TD-SCDMA 1, 2, 3, 4, 5, 7, 8, 12, 17, 34, 38, 39, 40, 41 - V1836T
Platform
Chipset Mediatek MT6771 Helio P60 (12 nm) Qualcomm SDM710 Snapdragon 710 (10 nm)
CPU Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) Octa-core (2x2.2 GHz 360 Gold & 6x1.7 GHz Kryo 360 Silver)
GPU Mali-G72 MP3 Adreno 616
OS Android 8.1 (Oreo), Funtouch 4 Android 9.0 (Pie), Funtouch 9
Selfie camera
Features - LED flash, HDR
Single 24 MP, f/2.0, 26mm (wide), 1/2.8", 0.9µm Motorized pop-up 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes
  32-bit/192kHz Hi-Res audio 32-bit/384kHz Hi-Res audio