> The first thing you should try is to restart your phone For that, hold the Home button and Wake or Sleep button together and keep holding until the phone logo appears.
> Some phone users have found a solution by going to Settings > General > Reset > Reset all Settings. (You will have to change the wallpaper, re-enter the password, and set up touch ID, but not a single data will be removed.)
> If the above two steps fail to fix the phone Touch Screen Not Working issue, then you need to perform a Factory reset. This process will erase all the phone’s data, but I will suggest to go for set up your phone after factory reset rather than restoring from iTunes or iCloud as many users have seen that restoring the data from iCloud or iTunes brought the problem back again.