i'm Vivo Y91i(1816)&i have a POWERFUL SPEC's
-6.22" Screen -Octa-Core 2.0 GHz Cortex-A53
-16GB Phone Storage+2GB Ram
-Rear Camera 13 MP, f/2.2 + 2 MP, f/2.4
-Front Camera 8 MP f/1.8
-Battery 4030mAh
-Snapdragon 439
-Android 8.1 Version(Oreo)
-Micro USB Charging Port+Support OTG -Support
(FingerPrint & Face Unlock)