You may have accidentally turned
TalkBack on when you began phone setup.
TalkBack is designed to give voice feedback to those who have visual impairment.If you accidentally turned
TalkBack on during phone setup, you can turn it off.
For phones with Android 8 or later, you can turn TalkBack off immediately. When you see the Turn off TalkBack button, tap it once, and then double tap anywhere on the screen to disable TalkBack.
For phones with Android 6 or 7: