Nokia 5250 - Manual (Page 11)

SIM card. After three consecutive incorrect PIN code entries, the code is blocked, and
you need the PUK code to unblock it.
PIN2 code — This code (4 - 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. Additional charges may apply, and all the
personal data in your device may be deleted. 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 network service provider whose SIM card
is in your device.
International Mobile Equipment Identity (IMEI) number — This number (15 or 17
digits) is used to identify valid devices on the GSM network. Devices that are, for
example, stolen, can be blocked from accessing the network. The IMEI number for
your device can be found under the battery.
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 coonectivity, or allowing such features to run in
the background 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 the
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 .
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