Q: Sometimes black vertical slim lines appeared on the screen and touch not working what can

Howdy Sin3210,

If you have lines that appear on the screen of your iPhone, I would suggest that you troubleshoot using the steps in this article - Get help with the screen on your iPhone, iPad, or iPod touch.

For the touchscreen issue you are experiencing use the steps here - If the screen on your iPhone, iPad, or iPod touch doesn't respond to touch.

Thanks for using Apple Support Communities.

Best to you.