vivo X21 has Android 8.1 ( Oreo ) , It offers an internal memory of 64/128 GB with 6 GB RAM , It presents a screen of Full HD+ resolution , And it comes with a battery capacity of 3200 mAh .
vivo X21 specifications
General
6421 Announce date : March , 2018
6421 Release date : March , 2018
6421 Height × Width : 154.5 mm x 74.8 mm ( 6.08 x 2.94 in )
6421 Thickness : 7.4 mm ( 0.29 in ) [ The average in this size : 8.8 mm ]
6421 Weight : 156.2 g ( 5.50 oz ) [ The average in this size : 200 g ]
6421 SIM : Hybrid Dual SIM ( Nano-SIM , dual stand-by )
6421 Colors : Black , Aurora White , Ruby Red
6421 Build : Front glass , aluminum body
vivo X21
Display
6421 Display type : Super AMOLED capacitive touchscreen , 16M
6421 colors
6421 Screen size : 6.28 inches (~85.2% screen-to-body ratio) [ The average
6421 in market : 5.2 inches ]
6421 Resolution : 1080 x 2280 pixels [ Full HD+ resolution ]
6421 Pixel density : (~402 ppi pixel density) [ The average in this size : 490 ppi
6421 pixel density ]
6421 Multitouch feature : yes
6421 Funtouch OS 4.0 : yes
Camera & Video
6421 Rear camera : Dual : 12 MP (f/1.8 , 1/2.5″ , 1.4 µm, Dual Pixel PDAF)
6421 + 5 MP (f/2.4) , phase detection autofocus , LED flash [ The average in
6421 this size : 15 MP ]
6421 Camera features : Geo-tagging , touch focus , face detection , HDR ,
6421 panorama
6421 Video : 1080p@30fps [ Full HD video ]
6421 Front camera : 12 MP , f/2.0 , 1080p [ The average in this size : 6 MP ]
Memory
6421 Expandable memory : Card slot microSD, up to 256 GB ( uses SIM 2
6421 slot )
6421 Internal Memory : 64/128 GB [ The average in this size : 96 GB ]
6421 RAM : 6 GB RAM [ The average in this size : 5 GB RAM ]
Battery
6421 Battery type : Non-removable Li-Ion
6421 Battery capacity : 3200 mAh [ The average in this size : 3350 mAh ]
Platform
6421 Operating System : Android 8.1 ( Oreo )
6421 Chipset : Qualcomm SDM660 Snapdragon 660
6421 Processor : Octa-core (4×2.2 GHz Kryo 260 & 4×1.8 GHz Kryo 260)
6421 Graphics : Adreno 512
Network
6421 2G bands : GSM 850 / 900 / 1800 / 1900 – SIM 1 & SIM 2 & CDMA
6421 800 & TD-SCDMA
6421 3G bands : HSDPA 850 / 900 / 1900 / 2100
6421 4G bands : LTE & LTE – India ( Band 40 )
6421 Speed : HSPA , LTE
6421 GPRS : yes
6421 EDGE : yes
Sound
6421 Alert types : Vibration , MP3 , WAV ringtones
6421 Loudspeaker : yes
6421 3.5 mm jack : yes
6421 32-bit/192kHz audio : yes
6421 Active noise cancellation with dedicated mic : yes
CONNECTIVITY
6421 WLAN : Wi-Fi 802.11 a/b/g/n/ac , dual-band , Wi-Fi Direct , hotspot
6421 Bluetooth : 5.0 , A2DP , LE
6421 GPS : yes , with A-GPS , GLONASS
6421 USB : MicroUSB 2.0 , USB On-The-Go
6421 Radio : FM radio
Features
6421 Sensors : Fingerprint ( rear-mounted ) , Accelerometer , Compass ,
6421 Proximity , Gyro , Ambient light sensor
6421 Messaging : SMS ( threaded view ) , MMS , Email , Push Mail
6421 Browser HTML5 : yes
6421 MP3/WAV/eAAC+/FLAC player : yes
6421 MP4/H.264 player : yes
6421 Document viewer : yes
6421 Photo/video editor : yes
6421 Fast battery charging : yes
vivo X21 disadvantages
6421 Java : No
6421 Removable battery : No
6421 Temperature sensor : No
6421 *** [ The averages are calculated for all phones released in 2016 & 2017
6421 ( for each size alone ) ]