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: 670 [Rate centres in NPA 670] [Dial plan for NPA 670]

NXX: 484

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
670-484 A Saipan MP CHLONN01CM0  4974 GUAM WIRELESS TELEPHONE COMPANY, LLC 870      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.