LG G3100 User Manual page 140

You can change the access codes :
Press [Menu] in standby mode.
Press 4 for direct access or use U and D to enter
.
Scroll to highlight
Select
If you want to change the : Security code, PIN, PIN2, input your
original code, and then press [OK].
Input new : Security code, PIN, PIN2, and verify them.
You can select the network which you will be registered either
automatically or manually. Usually, the selection of the network
used by the handset is automatic.
The phone automatically selects network which is available in the
area.
The phone will find the list of available networks and show you
them. Then you can select the network which you want to use if this
network has a roaming agreement with your home network
operator.
You can set a list of preferred networks the handset should attempt
to register with first, before attempting to register to any other
networks. This list is created from the handset's predefined list of
known networks.
menu.
by pressing [Select].
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