First of all I am using this vivo y15s for 1 year very satisfied with the mobile its does not get hang any time its battery backup is superb and it has 1GB ram and 8 gb rom and external memory is expandable upto 128 gb its camera quality is hd and click very good and cool selfie Its support Hd film without using any external software Sound quality is very good as you all know Vivo phone are known for Camera and Music