Hello frinds, vivo y21l I am using this phone sins 4 months. Its really very good & budget phone. 1gb ram, 16 gb internal. 1.2 ghz quad-core snapdragaon 410 processor. Cemra is also good. Usb otg suported. It is work good condition. 16gb internal storage that can be expended up to 128gb via a microSD card. The phone runs android 5.1 and powered by a 2000mah removable battery. Wifi, gps, and 4g 3g suported. Sensors on the phone inclued compass magnetometer, proximity sensor, accelerometer and ambient light sensor. I perefer to buy this phone.