424-403 phone numbers

Numbers 424-403-0000 to 424-403-9999 are assigned to T-Mobile USA, Inc. (rate centre CMTN CMTN, CA, NANPA abbreviation). 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

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

Reported numbers in 424-403