Network Connections
Turn off unused connections when not in use for example: Wi-Fi Bluetooth (Manage Connections)
Use “Auto On/Off” (Options>AutoOn/Off)
Use a single mode only. Choose 2G or 3G rather than 2G and 3G. (Options>Mobile Network)

Applications
When exiting, be sure to close the app, not leave it running in the background. (close with the ESC key, the rounded arrow not red power end key. Or, choose Menu button and scroll down to close)
Log out of applications when they are not needed.

Screen/Keyboard
Reduce Backlight Timeout (Options> Screen/Keyboard)
Reduce Backlight Brightness (Options > Screen/Keyboard)
Use a device holster (this turns off LCD automatically when you put your device away)
Set Audible Roll for your trackball to mute (Options> Screen/Keyboard)
Key Tone Off (Options> Screen/Keyboard)

Camera
Turn off flash (Camera > Options)
Set picture size to Small (Camera > Options)
Set Color Effect to Normal (Camera > Options)
Set Picture Quality to Normal (Camera > Options)

GPS
Turn off GPS when not required (Options > Advanced Options > GPS)
Use the zoom out function to get the largest viewable area that you can still use usefully.

Browsing
Close browser when finished using (close with ESC key, not red End key)

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