● 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 lifetime. To save battery power, note the following:
● Features that use Bluetooth coonectivity, or allowing such features to run in the
background while using other features, increase the demand on battery power.
Deactivate Bluetooth connectivity when you do not need it.
● If you have selected Packet data connection > When available in the
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 move 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. To set the device to use only the GSM network, select
Menu > Settings and Connectivity > Network > Network mode > GSM.
● The backlight of the display increases the demand on battery power. In the
display settings, you can adjust the display brightness and change the time-out
© 2010 Nokia. All rights reserved.14
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