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: 457

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-457 A Detroit Zone 6 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340      
313-457 0 Detroit Zone 6 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340      
313-457 1 Detroit Zone 6 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340      
313-457 2 Detroit Zone 6 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340      
313-457 3 Detroit Zone 6 MI LIVNMIUX0MD  5562 METROPCS, INC. 340   2006-01-29   
313-457 4 Detroit Zone 6 MI LIVNMIUX0MD  5562 METROPCS, INC. 340   2007-03-10   
313-457 5 Detroit Zone 6 MI LIVNMIUX0MD  5562 METROPCS, INC. 340   2006-01-29   
313-457 6 Detroit Zone 6 MI SFLDMIQJDS1  7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 340      
313-457 7 Detroit Zone 6 MI LIVNMIUX0MD  5562 METROPCS, INC. 340   2007-03-10   
313-457 8 Detroit Zone 6 MI   279B CLEAR RATE COMMUNICATIONS, INC. - MI 340   2019-04-28   
313-457 9 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2019-05-10   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.