← Area code 406
406-477 phone numbers
Numbers 406-477-0000 to 406-477-9999 are assigned to Range Tel Coop Inc in Lame Deer, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 406-477-0xxx, 406-477-2xxx, 406-477-5xxx, 406-477-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.