Iphone screen

We can't diagnose that issue remotely, sorry, but it sounds like a screen failure.

Have your device inspected at an Apple Store or AASP. After checking it out, they'll give you all the available options:

Apple – Location Selector

Regards

Giulio

Sorry about that. But you can go to an Apple Authorized Service Provider.

Take a look here---> https://locate.apple.com/asia/en/

choose your city / country / product.

Regards

Giulio