Hello! I am here Saheb saha.this phone has 3GB of RAM and 32gb of Inbuilt memory.and it expand upto 200 gyga bytes.and 5.2 screen size that is very comfortable to use.if you are business man so it is good to handling.this phone has Snapdragon 820 proccesor which help you for phone speed performance.if you are addicted on gaming so this is the best phone.this phone has 23 megapixel real camera resolution and 5 megapixel front camera resolution.23mp camera it means if you zooming on the object still it would be the best quality not like vga quality.and yes this phone has one issue that is heating issue.the heat is create from NFC.and about the sound quality this phone has the best surrounding sound and very clear sound quality.i am using this phone about 7 months and the best phone I am using!