Samsung SPH-A920 Phone Manual page 36

11.
Shift/Asterisk Key enters the asterisk [*] character for calling
features. In text entry mode, press to change the capitalization
mode.
12.
Power/Accessory Interface Connector allows you to plug in the
battery charger or connect optional accessories, such as a USB
cable.
13.
Microphone allows other callers to hear you clearly when you are
speaking to them.
14.
Plus Code Dialing Key automatically dials the international access
code for the country in which you are located (for instance, 011 for
international calls placed from the United States).
15.
Space/Pound Key enters the pound [#] character for calling
features. In text entry mode, press to enter a space.
16.
TransFLASH™ Memory Slot allows you to insert a specialized
memory card made especially for mobile phones. Your phone
supports up to 512 MB of TransFLASH memory.
17.
Back Key (Clear) deletes characters from the display 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 PCS Vision session.
14 Section 2A: Your Phone: The Basics