Canadial Know Who Called
← Area code 423

423-841 phone numbers

Numbers 423-841-0000 to 423-841-9999 are assigned to T-Mobile USA (rate centre MOUNTAINCY, TN, NANPA abbreviation). 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 423-841-1xxx, 423-841-2xxx, 423-841-4xxx, 423-841-5xxx, 423-841-6xxx, 423-841-7xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 423-841