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.
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Switch: BSTPMALLMMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
857-990 A Boston MA 139F WORLDCALL INTERCONNECT INC. 128      
857-990 0 Boston MA 139F WORLDCALL INTERCONNECT INC. 128   2015-11-13   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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