Hell, Friend, This Phone is very charm and upgrade model of Redmi 3s. It has sold almost 1 million units. so Very like for all person. the begest feature is battery backup very strong. It is working in very well.this phone is runs android 6.0. 0 OS and it is dual SIM. All feature is very good but screen is not protected by scratch resistant display and not removal battery.but fingerprint sensor is very nice.