← Area code 304
304-640 phone numbers
Numbers 304-640-0000 to 304-640-9999 are assigned to New Cingular Wireless PCS, LLC in Mount Hope, WV.
Not assigned to any carrier: 304-640-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.