821-333 phone numbers

Numbers 821-333-0000 to 821-333-9999 are assigned to Onvoy, LLC (rate centre SPARTANBG, SC, NANPA abbreviation). 7 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 821-333-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 821-333