Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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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   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 1 Fullerton CA   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 2 Fullerton CA   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 3 Fullerton CA   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 4 Fullerton CA   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 5 Fullerton CA   649C ONVOY, LLC - CA 730   2023-10-30   
657-681 6 Fullerton CA   6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 7 Fullerton CA   6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 8 Fullerton CA   6529 T-MOBILE USA, INC. 730   2023-10-27   
657-681 9 Fullerton CA   6529 T-MOBILE USA, INC. 730   2023-10-27   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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