LG Electronics G5400 Reset settings [Menu 4-7]

Accessing the Menu
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Automatic [Menu 4-6-1]
If you select Automatic mode, the phone will automatically search
for and select a network for you. Once you have selected
“Automatic”, the phone will be set to “Automatic” even though the
power is off and on.
Manual [Menu 4-6-2]
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. The phone let you select another network if the phone fails
to access the selected network. If you switch off the phone, the
phone will be reset to “Automatic”.
Preferred [Menu 4-6-3]
You can set a list of preferred networks and the phone attempts to
register with first, before attempting to register to any other
networks. This list is set from the phone’s predefined list of known
networks.
Reset settings [Menu 4-7]
You can initialize all factory defaults. You need Security code to
activate this function.