Nokia 5800EN - Manual (Page 20)

● PIN2 code — This code (4 to 8 digits) is supplied with some
SIM cards, and is required to access some functions in your
device.
● Lock code (also known as security code) — The lock code
helps you to protect your device against unauthorised use.
The preset code is 12345. You can create and change the
code, and set the device to 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. 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 operator
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 operator whose USIM card is in your
device.
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 technology, or allowing such
features to run in the background 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 the background while using other
features, increase the demand on battery power. WLAN on
your Nokia device switches off when you are not trying to
connect, not connected to an access point, or not scanning
for available networks. To further reduce battery
consumption, you can specify that your device does 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 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 UMTS network. You
can set the device to use only the GSM network. To only
use 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 change the
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