Canadial Know Who Called
← Area code 231

231-977 phone numbers

Numbers 231-977-0000 to 231-977-9999 are assigned to Fractel, LLC (rate centre MACKINAWCY, MI, NANPA abbreviation). 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-977-1xxx, 231-977-3xxx, 231-977-4xxx, 231-977-6xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 231-977