← Area code 580
580-855 phone numbers
Numbers 580-855-0000 to 580-855-9999 are assigned to Southwestern Bell in Carrier, OK. 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 580-855-0xxx, 580-855-3xxx, 580-855-6xxx, 580-855-7xxx, 580-855-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.