← Area code 231
231-875 phone numbers
Numbers 231-875-0000 to 231-875-9999 are assigned to Bandwidth.com CLEC, LLC in Fruitport, MI.
Not assigned to any carrier: 231-875-0xxx, 231-875-1xxx, 231-875-2xxx, 231-875-3xxx, 231-875-4xxx, 231-875-5xxx, 231-875-7xxx, 231-875-8xxx, 231-875-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.