231-257 phone numbers

Numbers 231-257-0000 to 231-257-9999 are assigned to Peninsula Fiber Network, LLC in Lake City, MI. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-257-1xxx, 231-257-2xxx, 231-257-3xxx, 231-257-5xxx, 231-257-6xxx, 231-257-7xxx, 231-257-8xxx, 231-257-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-257