apply, and all the personal data in your device may be deleted. For moreinformation, contact a Nokia Care Point or your device dealer.● 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 network service provider whoseSIM card is in your 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 network service providerwhose USIM card is in your device.● International Mobile Equipment Identity (IMEI) number — This number (15 or 17digits) is used to identify valid devices on the GSM network. Devices that are, forexample, stolen, can be blocked from accessing the network. The IMEI numberfor your device can be found under the battery.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 connectivity, or allowing such features to run in thebackground 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 theconnection settings, and there is no packet data coverage (GPRS), the deviceperiodically tries to establish a packet data connection. To prolong the operatingtime of your device, 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.Find help© 2010 Nokia. All rights reserved.14
