If your phone rings just once from a three-digit area code, you may assume the call is coming from somewhere in the United States and be tempted to call the number back. But satisfying your curiosity ...

Phone customers in the 313 area code, which covers Detroit and several suburbs, will have to start including the area code when making local calls. Here’s everything to know about when this change ...

State officials said they’ve almost exhausted the 313 area code and Detroiters will have to start dialing the full 10-digit phone number, even for local calls, starting in October. Beginning Oct. 7, ...