Canadial Know Who Called
← Area code 628

628-204 phone numbers

Numbers 628-204-0000 to 628-204-9999 are assigned to T-Mobile USA, Inc. in Nicasio, CA. 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 628-204