406-660 phone numbers

Numbers 406-660-0000 to 406-660-9999 are assigned to New Cingular Wireless PCS, LLC in Dillon, MT. 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 406-660-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 406-660