Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 313 [Rate centres in NPA 313] [Dial plan for NPA 313]

NXX: 499

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-499 A Detroit Zone 2 MI DTRTMILXDS0  9323 MICHIGAN BELL TEL CO 340      
313-499 0 Detroit Zone 2 MI   6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2010-12-10   
313-499 1 Detroit Zone 2 MI   318J COMCAST IP PHONE, LLC 340   2007-04-01   
313-499 2 Detroit Zone 2 MI   9323 MICHIGAN BELL TEL CO 340      
313-499 3 Detroit Zone 2 MI   046L CLEAR RATE COMMUNICATIONS, LLC 340   2009-06-04   
313-499 4 Detroit Zone 2 MI   9323 MICHIGAN BELL TEL CO 340      
313-499 5 Detroit Zone 2 MI   829J PAETEC ITEL, LLC 340   2005-07-26   
313-499 6 Detroit Zone 2 MI   829J PAETEC ITEL, LLC 340   2005-10-21   
313-499 7 Detroit Zone 2 MI   3535 ACD TELECOM, INC. - MI 340   2005-12-08   
313-499 8 Detroit Zone 2 MI   318J COMCAST IP PHONE, LLC 340   2007-04-01   
313-499 9 Detroit Zone 2 MI   6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2010-12-10   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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