← Area code 501
501-540 phone numbers
Numbers 501-540-0000 to 501-540-9999 are assigned to Onvoy Spectrum, LLC in McRae, AR. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 501-540-1xxx, 501-540-2xxx, 501-540-3xxx, 501-540-4xxx, 501-540-6xxx, 501-540-7xxx, 501-540-8xxx, 501-540-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.