LG C3310 Mode D'emploi page 238

Change codes [Menu 3-5-5]
The Change codes feature lets you change your current password
to a new one. You must enter the current password before you can
specify a new one.
Use this to change the access codes: PIN code, PIN2 code,
Security Code
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Note PIN: Personal Identification Number
Network settings [Menu 3-6]
The Network settings feature enables you to indicate whether the
network used when roaming(outside your home area) is selected
automatically, manually or preferably.
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Note You can select a network other than your home network only if it
has a valid roaming agreement with your home network.
Automatic [Menu 3-6-1]
Use this to set the phone to automatically search for and select one
of the cellular networks available in your area.
The phone will default back to Automatic if it is switched off.
Manual [Menu 3-6-2]
If you want to select the desired network manually from a list of
network, you can activate this function. If the connection to the
manually selected network is lost, the phone will sound an error
tone and ask you to select a network again. The selected network
must have a roaming agreement with your home network, that is,
the operator whose SIM card is in your phone. The phone will let
you select another network if the phone fails to access the selected
network. If you switch off the phone, the phone will be reset to
Automatic.
Settings [Menu 3]
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C3310 User Guide