636-331 phone numbers

Numbers 636-331-0000 to 636-331-9999 are assigned to T-Mobile USA, Inc. (rate centre FSSCRSTLCY, MO, NANPA abbreviation). 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 636-331