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To enable the shortcut:
• Go to Settings > Accessibility.
• Touch Volume key shortcut and turn it on
• To change the accessibility feature associated with the shortcut, touch Shortcut service.
• To use the Volume buttons from the lock screen, turn Allow from lock screen on
.
To use the shortcut:
Press and hold the Volume Up and Down buttons at the same time for three seconds. You'll hear confirmation that the feature has been turned
on or off.