← Area code 401
401-645 phone numbers
Numbers 401-645-0000 to 401-645-9999 are assigned to Teleport Communications America, LLC in Hope Valley, RI. 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 401-645-0xxx, 401-645-2xxx, 401-645-3xxx, 401-645-6xxx, 401-645-7xxx, 401-645-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.