← Area code 773
773-402 phone numbers
Numbers 773-402-0000 to 773-402-9999 are assigned to New Cingular Wireless PCS, LLC (rate centre CHICGOZN01, IL, NANPA abbreviation).
Not assigned to any carrier: 773-402-0xxx, 773-402-1xxx, 773-402-2xxx, 773-402-3xxx, 773-402-4xxx, 773-402-5xxx, 773-402-6xxx, 773-402-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.