← Area code 605
605-581 phone numbers
Numbers 605-581-0000 to 605-581-9999 are assigned to New Cingular Wireless PCS, LLC in Mobridge, SD. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 605-581-1xxx, 605-581-2xxx, 605-581-3xxx, 605-581-4xxx, 605-581-5xxx, 605-581-6xxx, 605-581-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.