Some mobile devices (usually older ones) have a dedicated screen-lock button, which you should move to OFF position in order to be able to use the touch screen.
Note: If this button doesn't respond at all, and you have tried all the options to resolve this issue, consider replacing the dedicated screen-lock button.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.