← Area code 951
951-803 phone numbers
Numbers 951-803-0000 to 951-803-9999 are assigned to T-Mobile USA, Inc. in Perris, CA. 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 951-803-4xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.