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request the code. Keep the new code secret and in a
safe place separate from your device. If you forget the
code and your device is locked, your device will require
service and additional charges may apply. Additional
charges may apply, and all the personal data in your
device may be deleted. For more information, contact
a Nokia Care Point or your device dealer.
• Personal unblocking key (PUK) code and PUK2
code — These codes (8 digits) are required to change a
blocked PIN code or PIN2 code, respectively. If the codes
are not supplied with the SIM card, contact the network
service provider 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 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 Packet data connection to When
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
time of your device, select Menu > Ctrl. panel >
Settings and Connection > Packet data > 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 3G 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
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