Occasionally different parts of the country grow so much and have so many local phone numbers that changes are needed. Sometimes new area codes are introduced and in some places people have to dial their local area code to complete a call. These changes are overseen by the North American Numbering Plan Administration (NANPA) which is overseen by the Federal Communications Commission (FCC).
In 2018, area code overlays and some new dialing instructions go into effect for:
Frontier wants you to be informed.