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: 688

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-688 A Dorchester MA SOVLMAABAMD  965H FRACTEL, LLC 128      
857-688 0 Dorchester MA   892D ONVOY, LLC - MA 128   2022-12-19   
857-688 1 Dorchester MA   624H ONVOY SPECTRUM, LLC 128   2022-03-20   
857-688 2 Dorchester MA   624H ONVOY SPECTRUM, LLC 128   2022-03-20   
857-688 3 Dorchester MA   892D ONVOY, LLC - MA 128   2022-12-19   
857-688 4 Dorchester MA   516J TON80 COMMUNICATIONS, LLC 128   2022-03-17   
857-688 5 Dorchester MA   892D ONVOY, LLC - MA 128   2022-12-19   
857-688 6 Dorchester MA   624H ONVOY SPECTRUM, LLC 128   2022-02-07   
857-688 7 Dorchester MA   624H ONVOY SPECTRUM, LLC 128   2022-02-07   
857-688 8 Dorchester MA   965H FRACTEL, LLC 128   2021-12-26   
857-688 9 Dorchester MA   892D ONVOY, LLC - MA 128   2022-12-19   

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

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