phone number formatting

NANP (North America: Canada, US, Mexico)

• since 10 digit calling, there isn't much of a reason to put the area code in parentheses?

• 613-702-0016

https://ja.wikipedia.org/wiki/日本の電話番号 %E6%97%A5%E6%9C%AC%E3%81%AE%E9%9B%BB%E8%A9%B1%E7%95%AA%E5%8F%B7