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← Area code 203

203-689 phone numbers

Numbers 203-689-0000 to 203-689-9999 are assigned to AT&T - Local (rate centre GUILFORD, CT, NANPA abbreviation). 9 of its ten thousand-number blocks are assigned to other carriers (number pooling).

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

Reported numbers in 203-689