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← Area code 623

623-552 phone numbers

Numbers 623-552-0000 to 623-552-9999 are assigned to T-Mobile USA, Inc. in Phoenix, AZ. 6 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 623-552