406-645 phone numbers

Numbers 406-645-0000 to 406-645-9999 are assigned to Onvoy, LLC in Deer Lodge, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 406-645-0xxx, 406-645-1xxx, 406-645-3xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 406-645