LG -G510 User Manual page 169

You can change the access codes:
Press [Menu] in standby mode.
Press key for direct access or use
.
Scroll to highlight
Select
If you want to change the PIN1/PIN2/Security code, input your
original code, and then press
Input new PIN1/PIN2/Security code, and verify the 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
your 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.
66
menu.
by pressing
[OK].
and
and to enter
[Select].