Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX: 971

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-971 A Charlestown MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-971 0 Charlestown MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2017-05-18   
857-971 1 Charlestown MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2016-06-17   
857-971 2 Charlestown MA   7135 TC SYSTEMS, INC. 128   2016-06-20   
857-971 3 Charlestown MA   892D ONVOY, LLC - MA 128   2016-08-05   
857-971 4 Charlestown MA   892D ONVOY, LLC - MA 128   2016-08-05   
857-971 5 Charlestown MA   892D ONVOY, LLC - MA 128   2016-06-08   
857-971 6 Charlestown MA   892D ONVOY, LLC - MA 128   2016-06-08   
857-971 7 Charlestown MA   892D ONVOY, LLC - MA 128   2016-06-08   
857-971 8 Charlestown MA   892D ONVOY, LLC - MA 128   2016-08-05   
857-971 9 Charlestown MA   515J IP HORIZON LLC 128   2017-07-02   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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