Since many smartphones require you to use a touch screen to perform most functions, you might not be able to do much with the phone when the screen goes blank and ... CDMA Cell How to Recover ...

That sounds impressive, but despite claims from Sony and others, 4K resolution on a phone-sized screen isn't going to produce a drastically sharper, clearer image for viewing text, photos and videos.

Sony has announced a new phone, which it says is the first to feature a 4K screen. It means the handset can display videos at four times the quality of 1080p high definition. The Xperia Z5 Premium ...