← Area code 605
605-240 phone numbers
Numbers 605-240-0000 to 605-240-9999 are assigned to New Cingular Wireless PCS, LLC in Salem, SD.
Not assigned to any carrier: 605-240-1xxx, 605-240-2xxx, 605-240-3xxx, 605-240-4xxx, 605-240-5xxx, 605-240-6xxx, 605-240-7xxx, 605-240-8xxx, 605-240-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.