Product
Vivo X20
Vivo X20
Xiaomi Mi Note 3
Xiaomi Mi Note 3
Battery
Charging - 18W wired, QC3
Type Li-Ion 3250 mAh, non-removable Li-Ion 3500 mAh, non-removable
Body
Build Glass front, aluminum back, aluminum frame Glass front (Gorilla Glass 4), glass back, aluminum frame
Dimensions 155.9 x 75.2 x 7.2 mm (6.14 x 2.96 x 0.28 in) 152.6 x 74 x 7.6 mm (6.01 x 2.91 x 0.30 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 159 g (5.61 oz) 163 g (5.75 oz)
Comms
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE
Infrared port - Yes
NFC No Yes
Positioning GPS GPS, GLONASS, BDS
Radio No No
USB microUSB 2.0, OTG USB Type-C
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
Protection - Corning Gorilla Glass 4
Resolution 1080 x 2160 pixels, 18:9 ratio (~402 ppi density) 1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Size 6.01 inches, 93.2 cm2 (~79.5% screen-to-body ratio) 5.5 inches, 83.4 cm2 (~73.8% screen-to-body ratio)
Type Super AMOLED IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (front-mounted), accelerometer, gyro, proximity, compass, barometer
Launch
Announced 2017, September. Released 2017, October 2017, September. Released 2017, September
Status Discontinued Discontinued
Main Camera
Dual 12 MP, f/1.8, AF 5 MP, f/2.4, (depth) 12 MP, f/1.8, 27mm (wide), PDAF, 4-axis OIS 12 MP, f/2.6, 52mm (telephoto), AF, 2x optical zoom
Features LED flash, HDR, panorama Dual-LED dual-tone flash, HDR, panorama
Video 1080p@30fps 4K@30fps, 720p@120fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 64GB 4GB RAM 64GB 6GB RAM, 128GB 6GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Matte Black, Black/Gold, Gold, Rose gold, Blue, Pink Black, Blue
Models X20A, 1721 MCE8
SAR - 0.50 W/kg (head)     1.54 W/kg (body)    
Network
2G bands GSM 900 / 1800 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 2, 3, 5, 7, 8, 34, 38, 39, 40, 41 1, 3, 5, 7, 8, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / EVDO / LTE
  1, 2, 3, 4, 5, 8, - X20A CDMA2000 1xEV-DO
Platform
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm SDM660 Snapdragon 660 (14 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU Adreno 512 Adreno 512
OS Android 7.1.1 (Nougat), upgradable to Android 8.0 (Oreo), Funtouch 3.2 Android 7.1 (Nougat), upgradable to Android 9, MIUI 12
Selfie camera
Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm 16 MP, f/2.5, (wide), 1/3.06" 1.0µm
Video 1080p@30fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes, with stereo speakers
  32-bit/192kHz audio 24-bit/192kHz audio