Sony Ericsson W850i Quick Start Manual page 6

Back key: press to take you back to a previous menu or screen. Press and
hold to return to the standby screen.
Clear key: press to delete a character of text. Press and hold to delete all
text. Press this key to delete contact entries and other items.
Walkman key: press to open the Walkman™ Music Player (see page 20).
Press again to return to the main menu.
Camera key (on the right side of the phone): press to start the camera,
and to take a photo or video clip.
Volume keys (on the right side of the phone): press to adjust the
volume, and to zoom in and out of photos.
Press once in standby mode to show the phone status.
Picture keys (above the screen): in standby mode, press the left picture
key to view your pictures full screen, or the right one to view them as
thumbnails.
In camera mode (see page 11) they change picture settings.
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