Users can assign a provisioned phone number (single use or reusable phone numbers) to a Campaign when editing a draft.

While the service to get provision phone numbers, Twilio, is trying to maintain a broad selection of area codes at all times, you can sometimes run into the issue where the area code you’re looking for is temporarily out of stock. If this ever happens, we recommend using overlay area codes as a workaround. You may find the complete list of area code overlays here.

An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay plans are used to increase the number of available telephone numbers in a province, state, or region.The North American Numbering Plan Administrator (NANPA) maintains the definitive list of overlays in the United States.