← Area code 231
231-852 phone numbers
Numbers 231-852-0000 to 231-852-9999 are assigned to New Cingular Wireless PCS, LLC in Ludington, MI. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 231-852-2xxx, 231-852-5xxx, 231-852-6xxx, 231-852-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.