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.

Switch: PHLAPAMKX4X

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
835-835 8 Reading PA 624H ONVOY SPECTRUM, LLC 228   2025-11-11   
835-835 9 Reading PA 624H ONVOY SPECTRUM, LLC 228   2025-11-11   
835-999 5 Philadelphia Suburban Zone 22 PA 624H ONVOY SPECTRUM, LLC 228   2024-01-14   
835-999 6 Philadelphia Suburban Zone 22 PA 624H ONVOY SPECTRUM, LLC 228   2024-01-14   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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