← Area code 307
307-385 phone numbers
Numbers 307-385-0000 to 307-385-9999 are assigned to T-Mobile USA, Inc. in Jackson, WY. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 307-385-1xxx, 307-385-2xxx, 307-385-3xxx, 307-385-4xxx, 307-385-5xxx, 307-385-6xxx, 307-385-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.