← Area code 231
231-258 phone numbers
Numbers 231-258-0000 to 231-258-9999 are assigned to Michigan Bell Tel Co in Kalkaska, MI.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.
Numbers 231-258-0000 to 231-258-9999 are assigned to Michigan Bell Tel Co in Kalkaska, MI.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.