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respectively. If the codes are not supplied with the
SIM card, contact the operator whose SIM card is in
your device.
● 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.
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 > Tools > 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 >
Tools > Settings and General >
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