← Area code 920
920-256 phone numbers
Numbers 920-256-0000 to 920-256-9999 are assigned to T-Mobile USA, Inc. (rate centre STURGEONBY, WI, NANPA abbreviation). 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 920-256-7xxx, 920-256-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.