and set the device to request the code. Keep the newcode secret and in a safe place separate from yourdevice. If you forget the code and your device is locked,your device will require service and additional chargesmay apply. For more information, contact a Nokia Carepoint or your device dealer.● Personal unblocking key (PUK) code and PUK2code — These codes (8 digits) are required to changea blocked PIN code or PIN2 code, respectively. If thecodes are not supplied with the SIM card, contact theoperator whose SIM card is in your device.● UPUK code — This code (8 digits) is required to changea blocked UPIN code. If the code is not supplied withthe USIM card, contact the operator whose USIM cardis in your device.Prolong battery lifeMany features in your device increase the demand onbattery power and reduce the battery life time. To savebattery power, note the following:● Features that use Bluetooth technology, or allowingsuch features to run in the background while usingother features, increase the demand on battery power.Turn Bluetooth technology off when you do not needit.● Features that use wireless LAN (WLAN), or allowingsuch features to run in the background while usingother features, increase the demand on battery power.WLAN on your Nokia device switches off when you arenot trying to connect, not connected to an access point,or not scanning for available networks. To furtherreduce battery consumption, you can specify that yourdevice does not scan, or scans less often, for availablenetworks in the background. See "WirelessLAN", p. 77. When Scan for networks is set toNever, the WLAN availability icon is not shown in thestandby mode. However, you can still manually scanfor available WLAN networks and connect to WLANnetworks as usual.● If you have set Packet data connection to Whenavailable in connection settings, and there is nopacket data coverage (GPRS), the device periodicallytries to establish a packet data connection. To prolongthe operating time of your device, select Packet dataconnection > When needed.● The Maps application downloads new mapinformation when you scroll to new areas on the map,which increases the demand on battery power. You canprevent the automatic download of new maps. See"Maps", p. 60.Useful information© 2008 Nokia. All rights reserved.18
