← Area code 620
620-601 phone numbers
Numbers 620-601-0000 to 620-601-9999 are assigned to T-Mobile USA, Inc. in Pratt, KS. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 620-601-2xxx, 620-601-3xxx, 620-601-4xxx, 620-601-5xxx, 620-601-6xxx, 620-601-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.