← Area code 660
660-670 phone numbers
Numbers 660-670-0000 to 660-670-9999 are assigned to United States Cellular (rate centre KIMBERLY, MO, NANPA abbreviation).
Not assigned to any carrier: 660-670-1xxx, 660-670-2xxx, 660-670-3xxx, 660-670-4xxx, 660-670-5xxx, 660-670-6xxx, 660-670-7xxx, 660-670-8xxx, 660-670-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.