Samsung SGH-A437DAAATT - Manual (Page 19)

Understanding Your Phone 16
Command Keys
Navigation Key
Use the directional keys on the navigation key to browse menus, sub menus, and
lists. Press the Up or Down Navigation when jumping to highlighted links on the
web.
Each key also acts as a shortcut to launch applications.
Speakerphone Key
During a call, press the key to enable the speakerphone option. Use the volume
keys (located on the left side of your phone) to adjust the volume.