← Area code 520
520-249 phone numbers
Numbers 520-249-0000 to 520-249-9999 are assigned to T-Mobile USA, Inc. (rate centre SIERRAVIST, AZ, NANPA abbreviation). 1 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.