For added security when showing your phone to someone else, use the screen pinning option to lock the display on the current app.
Home screen, tap
Screen pinning, and then tap the
On/Off switch to turn it on.
On the Apps screen, open the app that you want.
Press on the app thumbnail.
, and then tap
When prompted, tap
If you're using a lock screen, select the
Ask for unlock pattern before unpinning option for added security.
To unpin the screen, press and hold
and at the same.