← Area code 203
203-558 phone numbers
Numbers 203-558-0000 to 203-558-9999 are assigned to New Cingular Wireless PCS, LLC in Waterbury, CT.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.
Numbers 203-558-0000 to 203-558-9999 are assigned to New Cingular Wireless PCS, LLC in Waterbury, CT.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.