What is an area code “overlay”?
An overlay is the addition of another area code to the same geographic region as an existing area code. An overlay does not require customers to change their existing area code or telephone number. In this instance, the 331 area code is being added to the region served by the 630 area code in Illinois.
An overlay is the addition of another area code (in this case 442) to the same geographic region as an existing area code (760). An overlay does not require customers to change their existing area code. How does this affect providers of alarm and security services and equipment? As a result of the overlay, a new dialing procedure requires callers to dial 1 + area code + telephone number. This means that all calls in the 760 area code that are currently dialed with seven digits will need to be dialed using 1 + area code + telephone number. Alarm and security services and equipment currently located in the 760 area code and programmed to dial only seven digits must be updated or reprogrammed to dial 1+ area code + telephone number for all calls in the 760/442 area code. When will the change take place? Beginning May 2, 2009, customers should begin using the new dialing procedure (1 + area code + telephone number) when placing calls from the 760 area code. If customers forget and use the
An overlay is the addition of another area code to the same geographic region as an existing area code. In this instance, the 747 area code is being added to the region served by 818. An overlay does not require customers to change their existing area code or telephone number, but it does require callers with both area codes to dial the area code and the 7-digit number for all calls.
