Screen iPhone not working

Hi,

Sorry to hear you are having issues with touchscreen functionality on your iPhone.

I would recommend to force restart the device. If the touchscreen is unresponsive, majority of the time this can resolve your issue.

1. press and release the volume up button.
2. press and release the volume down button.
3. press and hold the power button until you see the Apple logo appear on the screen.  

• If your iPhone won't turn on or is frozen 

If this does not resolve your issue, you can also attempt to place the product in recovery mode to erase and restore via iTunes on a Mac or PC. This will then erase and restore iPhone to factory settings, including removing the iOS currently installed. Once erased and restored, the iPhone then reinstalls the latest iOS. 

Note: This applies only if the issue is unrelated to accidental or physical damage, and the device is supporting a genuine Apple display.

• If you can't update or restore your iPhone or iPod touch 

If you are still experiencing the issue, I would recommend contacting Apple Support to determine available service options. Based on the service request type, you would be eligible for a carry-in appointment at an ARS or AASP, as well as mail-in repair. 

• iPhone Repair 
• Get your iPhone, iPad, or iPod touch ready for service 

Hope this helps.