Phone customers in Michigan’s 313 area code, which covers Detroit and several nearby suburbs, will soon need to include the area code when dialing local calls.
The change comes as the region prepares for the introduction of the new 679 overlay area code.
With available phone numbers in the 313 area code running low, telephone service providers will begin assigning the 679 area code to new customers starting Nov. 7, 2025.
To accommodate this transition, all local calls within the 313 area code will require 10-digit dialing, meaning callers must include the area code with every call.
