An overlay is a new area code that serves a rate center when the primary area code is exhausted. We can use Manhattan as an example to illustrate this. 212 is an area code that serves the Manhattan area. If the 212 area codes runs out of numbers then the 646 area code can be overlaid on Manhattan so that new numbers can be issued for that rate center.
Overlays allow for new numbers to be issued to a rate center without that rate center having to be split which would require people to have to change their numbers.
When you search for a number in the Commio.io portal, if there are no numbers available in the requested NPA and overlay NPA will be shown in the results under "Related Results". To order a number simply click on it and then click "Start Order" at the bottom of the screen.
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