Detroit Moving to 10-Digit Dialing as 313 Area Code Runs Low, New 679 Code Coming

Metro Detroit must switch to 10-digit dialing by October 7, 2025. The change comes as state officials prepare to add a new 679 area code to the mix.

Starting this fall, calls won't connect without the area code prefix. Short seven-digit calls will stop working after the switch.

By early 2028, officials predict they'll run out of 313 numbers. While the new 679 code starts November 7, phone companies won't use it until they've given out all possible 313 combinations.

The change affects Detroit plus twelve nearby cities: Allen Park, Dearborn, Dearborn Heights, Ecorse, the Grosse Pointes, Hamtramck, Highland Park, Inkster, Lincoln Park, Redford Township, River Rouge, and Taylor.

"The timing is subject to change due to telephone numbering demand," said the Michigan Public Service Commission in a statement according to The Detroit Free Press.

Since 1947, 313 has marked Detroit's identity. Two splits occurred - first creating 810 in 1993, then adding 734 in 1997. Each split helped manage the growing need for phone numbers.

Current 313 holders keep their numbers. Costs stay the same, and local calling zones won't shift under the new rules.

Quick-dial emergency numbers stay simple. You'll still reach help by dialing 911, 988, 211, 311, 411, 511, 611, 711 or 811.

Before the switch, check and update your:

Come November 7, fresh phone lines might start with 679. But that won't happen until every last 313 option is gone.