LG G3100 User Manual page 127

You can use the access codes described in this section to avoid
unauthorised use of your phone. The access codes (except PUK1
and PUK2 codes) can be changed by using [Menu 4-5-6].
The PIN (Personal Identification Number) code protects your SIM
card against unauthorised use. The PIN code is usually supplied with
the SIM card. When is set , your phone
will request the PIN code every time it is switched on. On the
contrary, when is set , your phone
connects to the network directly without the request PIN code.
The PIN2 code, supplied with some SIM cards, is required to access
some functions such as Advice of call charge, Fixed Dial number.
These functions are only available if supported by your SIM card.
The PUK(PIN Unblocking Key) code is required to change a blocked
PIN code. The PUK code may be supplied with the SIM card. If not,
contact your local service provider for the code. If you lose the code,
also contact your service provider.
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