← Area code 424
424-375 phone numbers
Numbers 424-375-0000 to 424-375-9999 are assigned to Onvoy, LLC (rate centre CMTN GRDN, 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.