iPhone XS Max touch screen sudden frozen

Try a forced restart of your iPhone:--> Force restart iPhone - Apple Support

If you get no improvements, since your XS is still covered by warranty, have it inspected at an Apple Store or Authorized Service Provider:--> Apple – Location Selector

Regards

Giulio

hi

still my phone is not working the screen is black and I don't know what to do I did press the restart button but its not helpful please I need help