Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-437 A Roxbury MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128      
857-437 0 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2020-06-07   
857-437 1 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2020-06-07   
857-437 2 Roxbury MA CMBSMA01AMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128   2020-07-25   
857-437 3 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-01-02   
857-437 4 Roxbury MA CMBSMA01AMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128   2024-10-05   
857-437 5 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-01-02   
857-437 6 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-01-02   
857-437 7 Roxbury MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-01-02   
857-437 8 Roxbury MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2019-10-27   
857-437 9 Roxbury MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2019-10-27   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.