● Personal Unblocking Key (PUK) code and PUK2 code — These codes (8 digits) arerequired to change a blocked PIN code or PIN2 code, respectively. If the codesare not supplied with the SIM card, contact the operator whose SIM card is inyour device.● UPUK code — This code (8 digits) is required to change a blocked UPIN code. Ifthe code is not supplied with the USIM card, contact the operator whose USIMcard is in your device.Prolong battery lifeMany features in your device increase the demand on battery power and reduce thebattery lifetime. To save battery power, note the following:● Features that use Bluetooth technology, or allowing such features to run in thebackground while using other features, increase the demand on battery power.Turn Bluetooth technology off when you do not need it.● Features that use wireless LAN (WLAN), or allowing such features to run in thebackground while using other features, increase the demand on battery power.WLAN on your Nokia device switches off when you are not trying to connect, notconnected to an access point, or not scanning for available networks. To furtherreduce battery consumption, you can specify that your device does not scan, orscans less often, for available networks in the background.● If you have set Packet data connection to When available in connectionsettings, and there is no packet data coverage (GPRS), the device periodically triesto establish a packet data connection. To prolong the operating time of yourdevice, select Packet data connection > When needed.● The Maps application downloads new map information when you move to newareas on the map, which increases the demand on battery power. You canprevent the automatic download of new maps.● If the signal strength of the cellular network varies much in your area, your devicemust scan for the available network repeatedly. This increases the demand onbattery power.If the network mode is set to dual mode in the network settings, the devicesearches for the UMTS network. You can set the device to use only the GSM© 2008 Nokia. All rights reserved. 27
