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the USIM card, contact the network service provider
whose USIM card is in your device.
• International Mobile Equipment Identity (IMEI)
number — This number (15 or 17 digits) is used to
identify valid devices on the GSM network. Devices that
are, for example, stolen, can be blocked from accessing
the network. The IMEI number for your device can be
found under the battery.
Prolong battery life
Many features in your device increase the demand on
battery power and reduce the battery life time. To save
battery power, observe 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.
Switch off Bluetooth 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. The
WLAN on your Nokia device switches off when you are
not trying to connect, not connected to another access
point, or not scanning for available networks. To
further reduce battery consumption, you can specify
that your device not scan, or scans less often, for
available networks in the background.
• If you have set
available
in connection settings, and there is no packet
data coverage (GPRS), the device periodically tries to
establish a GPRS connection. To prolong the operating
12
time of your device, select
Packet data connection
Menu
Ctrl. panel
>
Settings
data connection
• 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 3G network. You
can set the device to use only the GSM network. To use
only the GSM network, select
Settings
mode
• 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. Select
Settings
Display
that observes lighting conditions and adjusts the
display brightness, in the display settings, select
sensor.
• To save power, activate the power save mode. Press the
power key, and select
deactivate it, press the power key, and select
to
When
Deactivate power
change the settings of certain applications when the
power save mode is activated.
>
and
Connection
Packet data
>
When
needed.
>
Menu
and
Phone
Network
>
> GSM.
Menu
and
General
Personalization
>
Light
time-out. To adjust the light sensor
>
Activate power
saving. You may not be able to
Packet
>
Ctrl. panel
>
>
Network
>
Ctrl. panel
>
>
>
Light
saving. To
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