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: 641 [Rate centres in NPA 641] [Dial plan for NPA 641]

NXX: 903

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
641-903 A Mason City IA DESMIAITX6X  6529 T-MOBILE USA, INC. 632      
641-903 0 Mason City IA DESMIADTXKX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 632      
641-903 1 Mason City IA CNVLIABC1MD  6266 UNITED STATES CELLULAR - IA 632      
641-903 2 Mason City IA DESMIADT1MD  9877 LEVEL 3 COMMUNICATIONS, LLC - IA 632      
641-903 3 Mason City IA DESMIADTXZX  6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 632      
641-903 4 Mason City IA DESMIADTXKX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 632      
641-903 5 Mason City IA DESMIADTXZX  6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 632      
641-903 6 Mason City IA DESMIAITX6X  6529 T-MOBILE USA, INC. 632      
641-903 7 Mason City IA DESMIADTFMD  221F ONVOY, LLC - IA 632      
641-903 8 Mason City IA DESMIAITX6X  6529 T-MOBILE USA, INC. 632      
641-903 9 Mason City IA DESMIAITX6X  6529 T-MOBILE USA, INC. 632      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.