Sony xperia Z5 premium is very very good smart phone .the sony is the most popular brand in this phone the network technology is GSM /HSPA/ LTE also in this phone .this is very lovely phone and very handy phone .camera quality is very very good in this phone .battery life is very good, 3gb ram in this phone .and 3430 mAh battery in this phone .nice looking phone .this is very different phone to other phone .and the sound quality of this phone is very very good and like so much this phone.very easy to use and very stylish phone the design of this phone is very good .thank you,