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: 281

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-281 A Cadillac MI WYNGMIKAGT2  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348      
231-281 0 Cadillac MI GDRPMIBLXDZ  5562 METROPCS, INC. 348   2021-09-28   
231-281 1 Cadillac MI GDRPMIBLXDZ  5562 METROPCS, INC. 348   2021-09-28   
231-281 2 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-03-06   
231-281 3 Cadillac MI GDRPMIBL04Z  543C ONVOY, LLCV - MI 348   2021-03-06   
231-281 4 Cadillac MI GDRPMIBLXDZ  5562 METROPCS, INC. 348   2021-03-14   
231-281 5 Cadillac MI GDRPMIBLXDZ  5562 METROPCS, INC. 348   2021-03-14   
231-281 6 Cadillac MI GDRPMIBL36Z  624H ONVOY SPECTRUM, LLC 348   2021-06-18   
231-281 7 Cadillac MI GDRPMIBL41Z  506J TWILIO INTERNATIONAL, INC. 348   2021-07-26   
231-281 8 Cadillac MI WYNGMIKAGT2  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2020-12-18   
231-281 9 Cadillac MI WYNGMIKAGT2  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 348   2020-12-18   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.