← Area code 878
878-587 phone numbers
Numbers 878-587-0000 to 878-587-9999 are assigned to Onvoy Spectrum, LLC in Enon Valley, PA. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 878-587-2xxx, 878-587-3xxx, 878-587-4xxx, 878-587-5xxx, 878-587-6xxx, 878-587-7xxx, 878-587-8xxx, 878-587-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.