← Area code 307
307-404 phone numbers
Numbers 307-404-0000 to 307-404-9999 are assigned to New Cingular Wireless PCS, LLC (rate centre MEDICINBOW, WY, NANPA abbreviation). 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 307-404-0xxx, 307-404-1xxx, 307-404-2xxx, 307-404-3xxx, 307-404-6xxx, 307-404-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.