When provisioning new phone numbers for your team, you may encounter "exhausted" area codes. This guide explains what this means and how to find available numbers in your target regions.
What is an Exhausted Area Code?
Due to high demand, certain geographic area codes have run out of unassigned phone numbers. If an area code is considered "exhausted" by telecom companies, new numbers can no longer be generated for it. Instead, telecom providers issue "overlay" area codes, which serve the exact same geographic region.
Exhausted Area Code Directory
If your desired area code is exhausted, you will need to provision a number using its corresponding overlay code. Attached is a PDF file that lists the exhausted area codes, their geographic regions, and the alternative overlay codes you can use: