← Area code 406
406-902 phone numbers
Numbers 406-902-0000 to 406-902-9999 are assigned to Level 3 Communications, LLC in Sheridan, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 406-902-0xxx, 406-902-2xxx, 406-902-3xxx, 406-902-4xxx, 406-902-5xxx, 406-902-6xxx, 406-902-7xxx, 406-902-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.