231-475 phone numbers

Numbers 231-475-0000 to 231-475-9999 are assigned to Bandwidth.com CLEC, LLC in Manton, MI. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-475-3xxx, 231-475-4xxx, 231-475-5xxx, 231-475-6xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-475