231-431 phone numbers

Numbers 231-431-0000 to 231-431-9999 are assigned to Onvoy, Llcv (rate centre CLAM RIVER, MI, NANPA abbreviation). 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-431-2xxx, 231-431-6xxx, 231-431-8xxx, 231-431-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-431