Super-sized 16GB ROM storage the new y21 has a staggering 16GB of ROM memory capacity, allowing you to store over 3,000 photos or 2,000 songs at the swipe of a finger. Take your favourite moments and most treasured memories with you wherever you go - you'll never be limited by storage space with the y21. Funtouch os 2.1 (Based on android5.1) Adapted from android 5.1, Vivo's fun touch os 2.1 Features a longer running time, more powerful performance, smoother operation and ultimate fun! make it completely yours with customizable functions like guest mode, global search and lock-screen avatar.