← Area code 406
406-502 phone numbers
Numbers 406-502-0000 to 406-502-9999 are assigned to Charter Ip Enabled Services, LLC in Helena, MT. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 406-502-0xxx, 406-502-3xxx, 406-502-4xxx, 406-502-5xxx, 406-502-6xxx, 406-502-7xxx, 406-502-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.