Clear your event log: Press Alt-LGLG. Open the menu and select Clear Log.
Exit open applications: Press Alt-Escape. Select an app, open its menu, and select Exit.
Enable memory cleaning: Go to Settings>Options>Security Options>Memory Cleaning. It's disabled by default, so select Enable.
Dispose of text messages: In the messaging screen, open the menu and select General Options. Change Keep Messages to 15 days.
Pull out the battery