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General

NameVivo X21iOppo A55-
ModelX21iA55-
Price-Upcoming-

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 / 2100-
Network 4GLTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)1, 3, 5, 8, 38, 40, 41-
Network SpeedHSPA, LTEHSPA 42.2/5.76 Mbps, LTE-A-
Network GPRSYesYes-
Network EDGEYesYes-

Display

Display TypeSuper AMOLED capacitive touchscreen, 16M ColorsIPS LCD Display-
Display Size6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio6.5 inches-
Display Resolution1080 x 2280 pixels, 19:9 ratio720 x 1600 pixels, 20:9 ratio-
Display MultitouchYes - Funtouch OS 4.0Yes-
Display Density402 ppi density--

Camera

Primary Camera12MP (f/1.8, 1/2.513MP, f/2.2, 25mm (wide), 1/3.06", 1.12µm, PDAF
2MP, f/2.4, (macro)
2MP, f/2.4, (depth)
-
Secondary Camera24MP16MP, f/2.0, (wide), 1/3.06", 1.0µm-
Camera FeaturesGeo-tagging, Touch focus, Face detection, HDR, panoramaHDR, panorama-
Video[email protected]1080p @30fps, 1920×1080 pixels-

Body

Body Dimensions154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in)163.9 x 75.1 x 8.4 mm (6.45 x 2.96 x 0.33 in)-
Body Weight159 g (5.61 oz)186 g (6.56 oz)-
Body ColorBlack, Aurora White, Ruby RedFairy White, Electric Black, Fancy Blue-

Launch

Launch AnnouncementMay, 2018Not announced-
Launch DateRelease May 19th, 2018August, 2021-

Platform

Operating SystemAndroid 8.1 OreoAndroid 10.0; ColorOS 7.2-
CPUOcta-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)Octa-core (4x1.8 GHz Kryo 240 & 4x1.6 GHz Kryo 240)-
GPUMali-G72 MP3Adreno 610-
ChipsetMediatek MT6771 Helio P60Qualcomm SM4250 Snapdragon 460 (11 nm)-

Memory

Memory Internal64GB, 128GB64GB ROM-
Memory ExternalmicroSD, up to 256GB (uses SIM 2 slot)microSDXC (dedicated slot)-
Ram4GB, 6GB 4GB RAM-

Battery

Battery TypeNon-removable Li-Ion BatteryLi-Poly (Lithium Polymer)-
Battery Capacity3425 mAh 5000 mAh-

Multimedia

Fm RadioYesNo-

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 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot-
Bluetooth5.0, A2DP, LE5.0, A2DP, LE, aptX HD-
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, GALILEO, BDS-

Features

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

Other

Made ByChinaChina-
Other FeaturesFast battery charging, MP4/H.264 player, MP3/WAV/eAAC+/FLAC player, Document viewer, Photo/video editor--