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: 231 [Rate centres in NPA 231] [Dial plan for NPA 231]

NXX: 788

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-788 A Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 0 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 1 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 2 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 3 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 4 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 5 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 6 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 7 Muskegon MI WLKMMIXGRS0  0695 FRONTIER NORTH, INC. - MI 348      
231-788 8 Muskegon MI GDRQMIBODMD  6003 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 348   2012-12-31   
231-788 9 Muskegon MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2015-12-17   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.