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 network service provider 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 network service provider 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.
•
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
.
•
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 3G network. To only
use the GSM network, press , and select
Tools
>
Settings
>
Phone
>
Network
>
Network mode
>
GSM
.
•
The backlight of the display increases the demand on
battery power. In the display settings, you can change
the time-out after which the backlight is switched off,
and adjust the brightness of the display.
•
Leaving applications running in the background
increases the demand on battery power. To close the
applications you do not use, press and hold , scroll to
an application in the list, and press
C
.
•
To turn on the power save mode, press the power key,
and select
Activate power saving
. To turn off the power
save mode, press the power key, and select
Deactivate
power saving
. You may not be able to change the
settings of certain applications when the power save
mode is turned on.
Free memory
To view how much space is available for different data types,
select
>
Tools
>
File mgr.
.
Many features of the device use memory to store data. The
device notifies you if the memory in different memory
locations is low.
18 Find help
www.nokia.com/support
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