← Area code 660
660-889 phone numbers
Numbers 660-889-0000 to 660-889-9999 are assigned to Level 3 Communications, LLC in Deepwater, MO. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 660-889-0xxx, 660-889-1xxx, 660-889-2xxx, 660-889-3xxx, 660-889-5xxx, 660-889-6xxx, 660-889-7xxx, 660-889-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.