← Area code 507
507-321 phone numbers
Numbers 507-321-0000 to 507-321-9999 are assigned to New Cingular Wireless PCS, LLC in Northfield, MN. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 507-321-5xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.