LG G5220 - Manual (Page 72)

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Preferred [Menu 4-6-3]
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.
User define [Menu 4-6-4]
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.
Restore factory settings [Menu 4-7]
You can set the handset to the default configuration by selecting this
menu. In addition, you need Security code to activate this function.
Settings [Menu 4]
Accessing the Menu
Note
• How to use Handfree portable:
If you want to use the handsfree portable(earphone), please
the button for a long time after inserting it to the connector
when incoming a call.