If you frequently hand your phone over to others, Guest Mode is a feature you should be using on Android. Jack Wallen shows you how to access the feature from your lock screen. Guest Mode is a very handy feature on the Android platform. With Guest Mode, you can hand your phone over to other users, knowing they won’t be able to peek inside your personal information.
Link: How to enable guest accounts from the lock screen in Android
via http://www.techrepublic.com