It seems like every person has at least one phone number. There are only so many phone number combinations to go around. Sometimes we need a new area code so we can have more phone numbers. When that happens, you may have to dial your own area code to make a local call.
This is called an area code overlay. The North American Numbering Plan Administration (NANPA) oversees this change, and the Federal Communications Commission (FCC) oversees NANPA.
Area code overlays and new dialing instructions are going into effect for: