The Smart Dialing feature can set a default country code and area code for phone numbers in the Contacts app so the country code and area code do not have to be entered each time a call is made, unless the country code or area code are different from the default codes that are set.
Some country codes are not supported by the smart dialing feature.
From a Home screen, tap Phone .
From the top of the display (where the time is located) swipe down to display additional options.
Tap Settings (located in the upper-right).
Tap Smart Dialing.
Tap Country Code then select the appropriate country code.
From the "Area Code" field, enter the area code.
Tap National Number Length then select the appropriate number length (e.g. 0, 1, 2, 10, 31, 32).
Tap the "Use 1 for National Dialing" On/Off switch to turn on or off .