LG G3100 User Manual page 137

In this menu, you can set the phone to ask for the PIN code of your
SIM card when the phone is switched on. If this function is
activated, you'll be requested to enter the PIN code.
Press [Menu] in standby mode.
Press 4 key for direct access or use U and D to enter
.
Scroll to highlight
Select
You can view the following submenus.
: Enable PIN code request.
: Disable PIN code request.
You can use security code to avoid unauthorized use of your phone.
When you switch on your phone, your phone will request security
code always if you set phone lock to "On". If you set phone lock to
"Automatic", your phone will request security code only when you
change your SIM card.
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menu.
by pressing [Select].