Samsung has launch a new series which is samsung z and new Samsung z4 is a good phone now am starting his sound system its sound system is good voice quality is good now come to user friendly yes samsung z4 is a user friendly phone now come to its Style and design samsung is a stylish mobile brand in price of 5500 its Style and Design is good in samsung z4 there are lots of features you have better ram better camera better bettry backup in its price range its totally a value for money mobile in my suggestion this is a goid mobile in his price range