Vivo Y55s smartphone is fast Working .it has good Look and smart color and short cuts function . So It is very easy to use .Display 5020 inch touchscreen, 1.4gz quad -core . if octa-core was even batter than. this Mobile phone is supper due to 3 GB ram 16 internal storage and supported up to 256 GB, 13 megapixel primary camera 5 megapixel front. but battery backup is not good .I think that battery back should become 4000 mah .Camera quality is supper and sound quality is also good.