← Area code 423
423-699 phone numbers
Numbers 423-699-0000 to 423-699-9999 are assigned to Verizon Wireless in Cleveland, TN. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 423-699-2xxx, 423-699-3xxx, 423-699-4xxx, 423-699-5xxx, 423-699-6xxx, 423-699-7xxx, 423-699-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.