Area code 671 covers part of Guamstate, covering most of Guam counties. It was started on Jan 01, 2000. This region follows Pacific/Guam timezone. Other popular area codes that belong to Guam state include .
| Date Changed | Change Details |
| Apr 16, 2012 | Area code 671-747 was introduced on Feb 23, 2012 and subscribers are operational from Apr 16, 2012. |
| May 24, 2009 | Area code 671-707 was introduced on Mar 26, 2009 and subscribers are operational from May 24, 2009. |
| Oct 01, 2005 | Area code 671-711 subscribers are operational from Oct 01, 2005. |
| Sep 01, 2005 | Area code 671-700 subscribers are operational from Sep 01, 2005. |
| Aug 10, 2002 | Area code 671-787 was introduced on Jun 13, 2002 and subscribers are operational from Aug 10, 2002. |
| Jun 29, 2001 | Area code 671-777 was introduced on May 08, 2001 and subscribers are operational from Jun 29, 2001. |
| Area Code | City | County | Population | Network Operator |
| 671-700 | 13,702 | Intralata Pic Validation | ||
| 671-707 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-711 | 688,713 | Telecommunications Relay Service | ||
| 671-726 | Harmon | Guam | -1 | PTI Pacifica Inc dba IT&E |
| 671-727 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-734 | Hagatna | Guam | -1 | TeleGuam Holdings LLC |
| 671-735 | Hagatna | Guam | -1 | TeleGuam Holdings LLC |
| 671-747 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-777 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-787 | Tamuning | Guam | -1 | Guam Wireless Telephone Company LLC |
| 671-788 | Tamuning | Guam | -1 | Guam Wireless Telephone Company LLC |
| 671-789 | Hagatna | Guam | -1 | TeleGuam Holdings LLC |
| 671-797 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
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