Samsung M520 Owner's Manual page 40

13.
END (Power) Key ends a call. Press and hold this key for two
seconds to turn your phone on or off. While in the main menu, it
returns the phone to standby mode and then cancels your input.
When you receive an incoming call, press this key to enter silent
mode and mute the ringer.
14.
BACK (Clear) Key deletes characters from the display while in text
entry mode. When in a menu, press the BACK key to return to the
previous menu. This key also allows you to return to the previous
screen in a
Sprint Vision session.
15.
Right Softkey allows you to select softkey actions or menu items
corresponding to the bottom right line on the display screen. It also
provides quick access to your phone contacts list.
16.
Navigation Key scrolls through the phone's menu options and acts
as a shortcut key from standby mode.
14 Section 2A: Phone Basics
Press Up to access Messaging.
Press Down to access My Content.
Press Right to launch Web.
Press Left to access the Media Player.
(Keys can be reassigned to create customized shortcuts.)