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: 313 [Rate centres in NPA 313] [Dial plan for NPA 313]

NXX: 855

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-855 A Detroit Zone 4 MI LIVNMIUX0MD  2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 340      
313-855 0 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-855 1 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-855 2 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-855 3 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-855 4 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-855 5 Detroit Zone 4 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-855 6 Detroit Zone 4 MI DTRTMIBASMD  516C AT&T CORP. 340      
313-855 7 Detroit Zone 4 MI LIVNMIUX0MD  2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 340      
313-855 8 Detroit Zone 4 MI LIVNMIUX0MD  2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 340      
313-855 9 Detroit Zone 4 MI LIVNMIUX0MD  2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 340      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.