← Area code 484
484-778 phone numbers
Numbers 484-778-0000 to 484-778-9999 are assigned to Level 3 Communications, LLC (rate centre MENDENHALL, PA, NANPA abbreviation). 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 484-778-0xxx, 484-778-1xxx, 484-778-5xxx, 484-778-7xxx, 484-778-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.