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General

NameVivo X21iXiaomi Redmi 8A Dual-
ModelX21iRedmi 8A Dual-
Price-8,000-

Network

Network TypeGSM / CDMA / HSPA / LTEGSM / HSPA / LTE-
Network 2GGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMAGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2-
Network 3GHSDPA 850 / 900 / 2100HSDPA 850 / 900 / 1900 / 2100-
Network 4GLTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500)-
Network SpeedHSPA, LTEHSPA, LTE-A-
Network GPRSYesYes-
Network EDGEYesYes-

Display

Display TypeSuper AMOLED capacitive touchscreen, 16M ColorsIPS LCD capacitive touchscreen, 16M colors-
Display Size6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio6.22 inches, 96.6 cm2 (~81.8% screen-to-body ratio)-
Display Resolution1080 x 2280 pixels, 19:9 ratio720 x 1520 pixels, 19:9 ratio (~270 ppi density)-
Display MultitouchYes - Funtouch OS 4.0Yes-
Display Density402 ppi density--
Display Screen Protection-Corning Gorilla Glass 5 400 nits typ. brightness-

Camera

Primary Camera12MP (f/1.8, 1/2.513MP, f/2.2, 1.12µm, PDAF
2MP, f/2.4
-
Secondary Camera24MP8MP, f/2.0, 1/4-
Camera FeaturesGeo-tagging, Touch focus, Face detection, HDR, panoramaLED flash, HDR, panorama-
Video[email protected][email protected]-

Body

Body Dimensions154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in)156.5 x 75.4 x 9.4 mm (6.16 x 2.97 x 0.37 in)-
Body Weight159 g (5.61 oz)188 g (6.63 oz)-
Body ColorBlack, Aurora White, Ruby RedDual SIM (Nano-SIM, dual stand-by)-
Body Build-Glass front (Gorilla Glass 5), plastic back, plastic frame-

Launch

Launch AnnouncementMay, 2018February,2020-
Launch DateRelease May 19th, 2018Release February,2020-

Platform

Operating SystemAndroid 8.1 OreoAndroid -
CPUOcta-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)Adreno 505-
GPUMali-G72 MP3Octa-core (4x1.95 GHz Cortex-A53 & 4x1.45 GHz Cortex A53)-
ChipsetMediatek MT6771 Helio P60Adreno 505Qualcomm SDM439 Snapdragon 439 (12 nm)-
OS Version-9.0 (Pie); MIUI 11-

Memory

Memory Internal64GB, 128GB32GB-
Memory ExternalmicroSD, up to 256GB (uses SIM 2 slot)microSDXC (dedicated slot)-
Ram4GB, 6GB 2GB, 3GB-

Battery

Battery TypeNon-removable Li-Ion Battery5000 mAh-
Battery Capacity3425 mAh Non-removable Li-Po-

Multimedia

Fm RadioYesYes-

Sound

AudioVibration, MP3, WAV RingtonesVibration, MP3, WAV ringtones-
LoudspeakerYesYes-
3.5mm JackYes - 32-bit/192kHz audio - Active noise cancellation with dedicated micYes-

Connectivity

WiFiWi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, HotspotWi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot-
Bluetooth5.0, A2DP, LE4.2, A2DP, LE-
USBmicroUSB 2.0, USB On-The-Go2.0, Type-C 1.0 reversible connector, USB On-The-Go-
GPSYes, with A-GPS, GLONASSYes, with A-GPS, GLONASS, BDS-

Features

SensorsFingerprint-rear-mounted, accelerometer, proximity, compassAccelerometer, proximity, compass-
MessagingSMS(threaded view), MMS, Email, Push EmailSMS(threaded view), MMS, Email, IM-
BrowserHTML5HTML5-
JavaNoNo-

Other

Made ByChinaChina-
Other FeaturesFast battery charging, MP4/H.264 player, MP3/WAV/eAAC+/FLAC player, Document viewer, Photo/video editorFast battery charging 18W Power bank/Reverse charging-