I reviewed this smartphone contains 512 MB ram and runs on android lollipop 5.1 which means operating system itself uses 400-420 MB ram. When I installed apps on it I experience whatsapp uses 30-40 MB ram and facebook uses 70-80 MB ram. I want to say that if we use whatsapp and facebook and they are running there is no choice you could run another app. It just hangs and slows down. It comes up with volte and 4G. It has 4 GB inbuilt memory which can be expandable upto 32GB. It has 5MP rear camera which gives average performance and a 2MP selfie camerathat is very poor. It comes up with 1650 mah battery which just drained before a complete day. The sound and calling ability of phone is good which is exceptional. The phone looks stylish from front but Not from back. So at this price I am not preferring it.