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: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX: 312

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-312 A Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358      
312-312 0 Chicago Zone 01-Calumet IL CHCGILMF4MD  5562 METROPCS, INC. 358   2018-05-06   
312-312 1 Chicago Zone 01-Calumet IL CHCGILMF4MD  5562 METROPCS, INC. 358   2018-05-06   
312-312 2 Chicago Zone 01-Calumet IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2018-05-04   
312-312 3 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2018-03-22   
312-312 4 Chicago Zone 01-Calumet IL CHCGILMF4MD  5562 METROPCS, INC. 358   2018-05-06   
312-312 5 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2018-03-22   
312-312 6 Chicago Zone 01-Calumet IL CHCGILMF4MD  5562 METROPCS, INC. 358   2018-05-06   
312-312 7 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2018-03-22   
312-312 8 Chicago Zone 01-Calumet IL CHCGILMF4MD  5562 METROPCS, INC. 358   2018-05-06   
312-312 9 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2018-03-22   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.