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: 531

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-531 A Muskegon MI GDRPMIBLXDZ  5562 METRO PCS, INC. 348      
231-531 0 Muskegon MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2019-09-19   
231-531 1 Muskegon MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2019-10-22   
231-531 2 Muskegon MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2019-10-22   
231-531 3 Muskegon MI   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS LLC 348   2020-07-06   
231-531 4 Muskegon MI   5562 METRO PCS, INC. 348   2020-06-26   
231-531 5 Muskegon MI   5562 METRO PCS, INC. 348   2020-06-26   
231-531 6 Muskegon MI   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS LLC 348   2020-07-06   
231-531 7 Muskegon MI   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS LLC 348   2020-07-06   
231-531 8 Muskegon MI   318J COMCAST IP PHONE LLC 348   2020-11-12   
231-531 9 Muskegon MI   5562 METRO PCS, INC. 348   2019-05-31   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.