Blackberry 7780 - Manual (Page 142)

8: Reference
142 User Guide
Maintenance
To Do this
Preserve battery life Set the Auto On/Off feature. Refer to page 112.
Turn off the radio when you are not in an area of
wireless coverage: Click the Turn Wireless Off icon.
Limit your use of the backlighting feature.
Delete the original message when you send a reply.
Refer to page 9.
If you want to send a message to multiple people, use
Add To, Add Cc, or Add Bcc instead of sending the
message multiple times. Refer to page 7.
Charge your handheld regularly.