THIS IS THE LATEST MOBILE VERSION OF 5.1 WITH 4G SUPPORTED, I LOVE THIS MOBILE BECAUSE MUSIC LISTENING EXPERIENCE IS TOO GOOD, AND THE LIFE OF THE BATTERY IS BETTER THAN THE ANY OTHER 4G PHONE, AND THIS IS THE STYLISH PHONE I HAVE EVER USED, FEATURES ARE TOO GOOD I NEVER THOUGHT I WILL USE THE HIGHLY FEATURED STYLISH PHONE IN THIS COST BCOZ ITS DURABILITY AND DESIGN OF THE MOBILE IS AWSOME, THIS IS FANTASTIC PHONE IN LOW COST THANK U SAMSUNG TO MAKING MY EVERYDAY BEAUTIFUL.