Area code 671 covers part of Guamstate, covering most of Guam counties. It was started on Apr 19, 2003. This region follows Pacific/Guam timezone. Other popular area codes that belong to Guam state include .
| Date Changed | Change Details |
| Jan 19, 2013 | Area code 671-987 was introduced on Jul 22, 2005 and subscribers are operational from Jan 19, 2013. |
| Apr 04, 2011 | Area code 671-971 was introduced on Feb 09, 2011 and subscribers are operational from Apr 04, 2011. |
| May 21, 2010 | Area code 671-998 was introduced on Mar 30, 2010 and subscribers are operational from May 21, 2010. |
| Apr 29, 2010 | Area code 671-997 was introduced on Mar 30, 2010 and subscribers are operational from Apr 29, 2010. |
| Mar 28, 2010 | Area code 671-989 was introduced on Feb 03, 2010 and subscribers are operational from Mar 28, 2010. |
| Oct 30, 2009 | Area code 671-979 was introduced on Sep 03, 2009 and subscribers are operational from Oct 30, 2009. |
| Area Code | City | County | Population | Network Operator |
| 671-911 | 809,913 | Emergency Services | ||
| 671-922 | Harmon | Guam | -1 | PTI Pacifica Inc dba IT&E - GU |
| 671-929 | Tamuning | Guam | -1 | Guam Wireless Telephone Company LLC |
| 671-958 | 497,960 | Standard Plant Test Code | ||
| 671-959 | 92,961 | Standard Plant Test Code | ||
| 671-967 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-969 | Dededo | Guam | -1 | Guam Telecom LLC - GU |
| 671-971 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-972 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-977 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-979 | Harmon | Guam | -1 | PTI Pacifica Inc dba IT&E - GU |
| 671-987 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-988 | Tamuning | Guam | -1 | Guam Wireless Telephone Company LLC |
| 671-989 | Dededo | Guam | -1 | Guam Telecom LLC - GU |
| 671-997 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
| 671-998 | Susupe (saipan) | Guam | -1 | PTI Pacifica Inc |
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