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General

NameZTE Blade A31 Vivo X21i-
ModelBlade A31 X21i-
PriceUpcoming--

Network

Network Type GSM / CDMA / HSPA / EVDO / LTE / 5G GSM / CDMA / HSPA / LTE-
Network 2GGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA-
Network 3G HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 2100-
Network 4G LTE (unspecified) LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)-
Network Speed HSPA 42.2/5.76 Mbps, LTE-A, 5G HSPA, LTE-
Network GPRSYesYes-
Network EDGEYesYes-
Network 5G 1, 3, 41, 78, 79 SA/NSA --

Display

Display Type IPS LCD capacitive touchscreen Super AMOLED capacitive touchscreen, 16M Colors-
Display Size 6.52 inches 6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio-
Display Resolution 720 x 1560 pixels 1080 x 2280 pixels, 19:9 ratio-
Display MultitouchYesYes - Funtouch OS 4.0-
Display Density-402 ppi density-

Camera

Primary Camera16MP
8MP
2MP
12MP (f/1.8, 1/2.5-
Secondary Camera 8MP 24MP-
Camera Features panorama, HDR Geo-tagging, Touch focus, Face detection, HDR, panorama-
Video 1080p @30fps, 1920×1080 pixels [email protected]-

Body

Body Dimensions-154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in)-
Body Weight-159 g (5.61 oz)-
Body Color Gray, Blue Black, Aurora White, Ruby Red-

Launch

Launch Announcement Not announced May, 2018-
Launch Date Exp. December 2021 Release May 19th, 2018-

Platform

Operating System Android 10 Android 8.1 Oreo-
CPU-Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)-
GPU-Mali-G72 MP3-
Chipset MediaTek MT6853V Dimensity 720 5G (7 nm) Mediatek MT6771 Helio P60-

Memory

Memory Internal128GB 64GB, 128GB-
Memory External microSDXC microSD, up to 256GB (uses SIM 2 slot)-
Ram6GB 4GB, 6GB -

Battery

Battery TypeLi-Poly Non-removable Li-Ion Battery-
Battery Capacity 5000 mAh 3425 mAh -

Multimedia

Fm RadioNoYes-

Sound

Audio Vibration, MP3, WAV ringtones Vibration, MP3, WAV Ringtones-
LoudspeakerYesYes-
3.5mm JackYesYes - 32-bit/192kHz audio - Active noise cancellation with dedicated mic-

Connectivity

WiFi Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, Hotspot-
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE-
USB USB Type-C 2.0 microUSB 2.0, USB On-The-Go-
GPS Yes, with A-GPS Yes, with A-GPS, GLONASS-

Features

Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint-rear-mounted, accelerometer, proximity, compass-
Messaging SMS(threaded view), MMS, Email, IM SMS(threaded view), MMS, Email, Push Email-
Browser HTML5 HTML5-
JavaNoNo-

Other

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