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: 939 [Rate centres in NPA 939] [Dial plan for NPA 939]

NXX: 606

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
939-606 A Mayaguez PR BYMNPRCO0MD  8645 SUNCOM DBA T-MOBILE USA 820      
939-606 0 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2021-11-25   
939-606 1 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2021-11-25   
939-606 2 Mayaguez PR   091J LUMEN TECHNOLOGIES PUERTO RICO, LLC 820   2020-03-08   
939-606 3 Mayaguez PR   559F NEUTRAL TANDEM - PR 820   2021-07-31   
939-606 4 Mayaguez PR   559F NEUTRAL TANDEM - PR 820   2021-07-31   
939-606 5 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2021-11-25   
939-606 6 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2021-11-25   
939-606 7 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2022-12-23   
939-606 9 Mayaguez PR   8645 SUNCOM DBA T-MOBILE USA 820   2018-06-14   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.