Luckily Android 5.0 Lollipop comes with a System level Guest mode. Android 5.0 Guest mode allow you to Quickly Switch to a Different Profile (Guest) that doesn’t have any of your Data and Settings. The guest mode is as good as a Fresh Install of a OS, in Guest mode the user cant access your Phone Data’s such as installed Apps, messages, contacts Etc.
If you switch back to your Default Google Profile, all Settings and Data saved in guest mode will Delete Automatically.
How to Enable Guest Mode in Android 5.0 Lollipop
Swipe Down on the Top of the Screen. It will bring the Notification bar.
At the top right tap twice at your Profile picture
Now you will see three icons Your Google Profile, Add Guest and Add User.
Tap on Add Guest
Now Android Lollipop will switch to guest mode. The guest mode take few minutes to load and the Phone may lag and slightly Slow.
You can Easily Exit Guest mode and revert to your Google Account, to Do that Swipe Down on the Top of the Screen to bring the Notification bar.
At the top right tap twice at your Avatar
The three Icons will Appear, Tap on your Google Account icon. Now Android will Delete all Data and Settings Saved in the Guest mode.
If you don’t have Android 5.0 Lollipop, you can use Pre loaded guest modes. Some brands such as Samsung, LG, Xiaomi Pre loaded an App that Allow you to use Guest mode on your Smartphone. The Guest mode App name will be Different for Each Brands, so Search your Phone Apps with names such as Guest mode or kids mode.