231-588 phone numbers

Numbers 231-588-0000 to 231-588-9999 are assigned to Frontier North, Inc. in Ellsworth, MI. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-588-4xxx, 231-588-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-588