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Remote lock
To prevent unauthorised use of your device, you can lock
your device and memory card remotely using a text
message. You must define the message text, and to lock
your device, send that text message to your device. To
unlock your device, you need the lock code.
To enable remote locking and to define the text message
content to be used, select 
Menu
 > 
Ctrl. panel
 and
Phone
 > 
Phone mgmt.
 > 
Security
 > 
Phone and SIM
card
 > 
Remote phone locking
 > 
Enabled
. Enter the
text message content (5 to 20 characters), verify it, and
enter the lock code.
Prolong battery life
Many features in your device increase the demand on
battery power and reduce the battery lifetime. To save
battery power, note the following:
• Features that use Bluetooth technology, or allowing
such features to run in the background while using
other features, increase the demand on battery power.
Deactivate Bluetooth technology when you do not need
it.
• Features that use wireless LAN (WLAN), or allowing such
features to run in the background while using other
features, increase the demand on battery power. WLAN
on your Nokia device deactivates when you are not
trying to connect, not connected to an access point, or
not scanning for available networks. To further reduce
battery consumption, you can specify that your device
does not scan, or scans less often, for available
networks in the background.
• If you have set 
Packet data connection
 to 
When
available
 in connection settings, and there is no packet
data coverage (GPRS), the device periodically tries to
establish a packet data connection. To prolong the
operating time of your device, select 
Packet data
connection
 > 
When needed
.
• The Maps application downloads new map information
when you scroll to new areas on the map, which
increases the demand on battery power. You can
prevent the automatic download of new maps.
• If the signal strength of the cellular network varies
much in your area, your device must scan for the
available network repeatedly. This increases the
demand on battery power.
If the network mode is set to dual mode in the network
settings, the device searches for the UMTS network. You
can set the device to use only the GSM network. To use
only the GSM network, select 
Menu
 > 
Ctrl. panel
 >
Settings
 and 
Phone
 > 
Network
 > 
Network
mode
 > 
GSM
.
• The backlight of the display increases the demand on
battery power. In the display settings, you can change
the length of the time-out period after which the
backlight is switched off, and adjust the light sensor
that observes lighting conditions and adjusts the
display brightness. Select 
Menu
 > 
Ctrl. panel
 >
Settings
 and 
General
 > 
Personalisation
 > 
Display
and 
Light time-out
 or 
Brightness
.
• Leaving applications running in the background
increases the demand on battery power. To close the
applications you are not using, press and hold the menu
12
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2009-06-25 13:15:48 P3657 user guide publication 3