← Area code 507
507-231 phone numbers
Numbers 507-231-0000 to 507-231-9999 are assigned to Onvoy, LLC in Janesville, MN.
Not assigned to any carrier: 507-231-0xxx, 507-231-1xxx, 507-231-2xxx, 507-231-3xxx, 507-231-4xxx, 507-231-5xxx, 507-231-6xxx, 507-231-8xxx, 507-231-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.