The 
tab allows you to specify which calls should be treated as local by your tariff table.
To localise a tariff, select it from the drop-down list, enter your local area code and the band name, then click on the 
button, as shown below:
A new window will appear, asking you to confirm the action; click 
if you want to localise your tariff. The local area codes will be displayed in the right-hand panel, as shown below:
