Canadial Know Who Called
← Area code 520

520-478 phone numbers

Numbers 520-478-0000 to 520-478-9999 are assigned to Teleport Communications America, LLC in Ajo, AZ. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 520-478-2xxx, 520-478-3xxx, 520-478-4xxx, 520-478-5xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 520-478