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the SIM card and is supported by UMTS mobile
phones.
● 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. 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 life time. 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.
See "Wireless LAN", p. 109. When Scan
for networks is set to Never, the WLAN availability
icon is not shown in the standby mode. However,
you can still manually scan for available WLAN
networks and connect to WLAN networks as usual.
● 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
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