For more information, please visit www. History[ edit ] In the original North American Numbering Plan of , all of the Chicago area was covered by area code , the rest of northern Illinois was , central Illinois was , and southern Illinois was Likewise, area code has been reserved for an overlay of and area code reserved for an overlay of in the near future, but no timelines exist. Area code has been reserved for an overlay for , but has not been implemented and no timeline exists. Customers can still dial three digits to reach , , , , , , and
The Illinois Commerce Commission approved adding the area code to the region to ensure that businesses and consumers have access to numbers from their carrier of choice. The last overlay implemented in Illinois was in For more information, please visit www. In March , the overlay area code was added for area, as was the overlay area code for Over the past 10 years, telecommunications carriers successfully implemented 50 area code overlays throughout the U. History[ edit ] In the original North American Numbering Plan of , all of the Chicago area was covered by area code , the rest of northern Illinois was , central Illinois was , and southern Illinois was There are no immediate plans for relief for area code In , area code was split off to cover western central Illinois which was previously the southwestern part of area code Area code has been reserved for an overlay for , but has not been implemented and no timeline exists. All such devices will need to be reprogrammed with the new dialing procedure prior to February 17, Examples of programmed equipment and features include: An area code overlay is the addition of another area code e. After this date, if they do not use the new dialing procedure the call will not be completed, and a recording will instruct callers to hang up and dial again. Area code almost immediately exhausted its numbers, so an overlay area code, , was implemented in for supplemental numbers. Likewise, area code has been reserved for an overlay of and area code reserved for an overlay of in the near future, but no timelines exist. With the depletion of new numbers in area codes and , an overlay of both of them, area code , was created in November , beginning digit dialing within the city limits of Chicago. All customers who have an area code phone number today will keep the area code. Customers can still dial three digits to reach , , , , , , and In addition to changing the dialing procedure, customers are encouraged to begin reprogramming their automatic dialing equipment and all other types of equipment that are currently programmed with only seven digits on an area code phone number. However, mandatory digit dialing was not in effect until Phone numbers with the new area code may be issued after March 17, Shortly after in , area code was created as an area code split to cover the residential parts of the city of Chicago while downtown kept the original area code. The new dialing procedure will be mandatory beginning Feb. Area codes north suburbs and west suburbs were split off from the suburban area code in
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