Just 4 month before I purchase this smartphone Sony xperia xz but I face some problem in device .first the voice automatically low when we pick up the call and ringtone volume is very low even I full the volume.it is same low volume in notification and media.it lagging specially open multiple applications.and chrome lagg when open multiple windows, camera need to be more improve specially when zooming.long time to charge 100 percent battery, so it need to more updated and improved.i am not satisfy with this.