← Area code 406
406-960 phone numbers
Numbers 406-960-0000 to 406-960-9999 are assigned to Level 3 Communications, LLC in Dillon, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 406-960-1xxx, 406-960-2xxx, 406-960-3xxx, 406-960-5xxx, 406-960-6xxx, 406-960-8xxx, 406-960-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.