Local Calling Guide

Area code/prefix search

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NPA: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 681

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-681 A Fullerton CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730      
657-681 0 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 1 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 2 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 3 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 4 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 5 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-10-30   
657-681 6 Fullerton CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 7 Fullerton CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 8 Fullerton CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 9 Fullerton CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-10-27   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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