LG G5300 Mode D'emploi page 62

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.
You can add entries or delete new ones from the network list. This
can even include new networks whose network codes are not known
to the handset. To do this, select and then enter the network code,
country code and network name.
You can set the handset to the default configuration by selecting this
menu. In addition, you need Security code to activate this function.
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