LG G4020 - Manual (Page 79)

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Cost Settings Menu 6.7
Call Cost’s Limit (Menu 6.7.1)
This network service allows you to limit the cost of your calls by selected
charging units. If you select Read, the number of remaining unit is shown.
If you select Change, you can change your charge limit.
Set Tariff (Menu 6.7.2)
You can set the currency type and the unit price. Contact your service
providers to obtain charging unit prices. To select the Currency or 1 Unit
in this menu, you need the PIN2 code.
Auto Display (Menu 6.7.3)
This network service allows you to see automatically the cost of your last
calls.
Recent Calls
Note When all units have been used, no calls can be made except emergency
calls. Depending on the SIM card, you need the PIN2 code to set a call
cost limit.
* : Shown only if supported by SIM card
*