LOCK THE SCREEN ORIENTATION
The screen rotates automatically when you turn the phone 90 degrees. 
To lock the screen in portrait mode, swipe down from the top of the screen, and tap 
Auto-rotate to switch to Portrait.
USE THE NAVIGATION KEYS
To see which apps you have open, tap the overview key . 
To switch to another app, tap the app you want. To close an app, tap the  icon 
next to it.
To go back to the previous screen you were in, tap the back key . Your phone 
remembers all the apps and websites you've visited since the last time your screen 
was locked.
To go to the home screen, tap the home key . The app you were in stays open in 
the background.
OPEN TWO APPS AT ONCE
For easier navigation between apps, press and hold the overview  key to divide 
the screen between two apps. To go back to normal view, press and hold the 
overview  key again.
Nokia 3.1 User Guide
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