Set a default area code or country code
You can use smart dialing to set a default area code and country code that is applied automatically to the phone numbers
that you call, so that you don't have to dial the country code or area code when you make a call within your own country or
In the Phone app, swipe down from the top of the screen.
> Smart Dialing.
• To change the default country code, tap Country Code. Tap a country.
• To change the default area code, in the Area Code field, type an area code.
Phone and voice
Tap any of the drop-down lists to change other smart dialing options.