Press and hold the Sleep/Wake button and the Home button at the same time. When you see the Apple logo appear on the display, release both buttons. Force restart your iPhone and see if the touch screen is working again. If it isn't, go ahead and try the next method to narrow down the fault. Option 2.
Many iPhone users have experienced touchscreen issues, such as not working at few areas, random typing or freezing. If you are one of them, you may find some helpful solutions or suggestions in this Apple Community thread. Join the discussion or ask your own question here.Then follow these steps: Make sure that the Touch ID sensor and your finger are clean and dry. Tap Settings > Touch ID & Passcode, then enter your passcode. Tap Add a Fingerprint and hold your device as you normally would when touching the Touch ID sensor. Touch the Touch ID sensor with your finger—but don't press—so the device can begin
It is always best to stay calm if your touch screen freezes or does not respond to touch. You do not have to run to the nearest Apple service center to have your iPhone fixed immediately. More often than not, fixing this issue is quite easy, and all it needs is some simple troubleshooting to have it back up and running.
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