← Area code 712
712-346 phone numbers
Numbers 712-346-0000 to 712-346-9999 are assigned to T-Mobile USA, Inc. in Spencer, IA. 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 712-346-1xxx, 712-346-2xxx, 712-346-4xxx, 712-346-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.