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• UPUK code — This code (8 digits) is required to change a
blocked UPIN code. If the code is not supplied with the
USIM card, contact the operator whose USIM card is in your
device.
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
>
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.
• If you have set
Packet data connection
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
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2009-06-25 13:16:47 P3657 user guide publication 3
operating time of your device, select
connection
When
>
• 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
and
Phone
>
Settings
and
Phone
>
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
>
Personalisation
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 key, scroll to
the application, and press the backspace key.
• To save power, activate the power save mode. Press the
to
When
power key, and select
deactivate it, press the power key, and select
power
saving. You may not be able to change the settings
Magenta
Magenta
Yellow
Yellow
Black
Black
Packet data
needed.
Menu
Ctrl. panel
>
>
Network
Network mode
>
>
>
Settings
and
General
>
>
Display
and
Light time-out
or
>
Activate power
saving. To
Deactivate
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