Tap Restart phone.
After your has phone restarted, a message about the lock screen will be read aloud. Tap the lock screen at any time to hear the time, date and notifications read aloud. To unlock your phone, flick the screen up. (If you have a password, tap any number key to hear that number read aloud, then double-tap to enter the number as part of your password.)
If this is the first time you've turned on Mobile Accessibility, you'll be presented with a training session to help you quickly learn how to use it. (You can return to the training at any time by triple-tapping the screen to access the Quick Menu, then selecting Support > Touch Training.) Otherwise, the Mobile Accessibility home screen will load.
Worse case a hard reset will clear it (you will of course erase the phone)