Palm Treo 700p User Manual page 29

You can forward calls to a different number or let all calls be picked up by
voicemail (see "Call Forwarding" on page 73).
As with any mobile phone, if you are in an area with no wireless coverage,
your device searches for a signal, which consumes power. If you cannot move
to an area of better coverage, you may want to temporarily turn off your
phone. While your phone is off, you can continue to use your device's
nonwireless features.
Turn down the screen brightness (see "Adjusting the Brightness" on
page 286).
Decrease the settings in Power Preferences and turn off Beam Receive (see
"Optimizing Power Settings" on page 296).
Turn off the Bluetooth® feature if you are not using it (see "Connecting to a
Bluetooth Hands-Free Device" on page 84).
Section 1A: Device Setup 17