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 |
| Oct 25, 2013 | Area code 671-864 subscribers are operational from Oct 25, 2013. |
| Nov 24, 2008 | Area code 671-858 was introduced on Oct 10, 2008 and subscribers are operational from Nov 24, 2008. |
| Oct 01, 2005 | Area code 671-811 subscribers are operational from Oct 01, 2005. |
| Mar 14, 2005 | Area code 671-878 was introduced on Jan 13, 2005 and subscribers are operational from Mar 14, 2005. |
| Oct 23, 2004 | Area code 671-838 was introduced on Aug 25, 2004 and subscribers are operational from Oct 23, 2004. |
| Oct 14, 2004 | Area code 671-898 was introduced on Aug 24, 2004 and subscribers are operational from Oct 14, 2004. |
| Area Code | City | County | Population | Network Operator |
| 671-811 | 233,813 | One Call Services-Pipeline And Utility Safety | ||
| 671-828 | Hagatna | Guam | -1 | TeleGuam Holdings LLC |
| 671-838 | Tamuning | Guam | -1 | Wave Runner LLC |
| 671-848 | Tamuning | Guam | -1 | Wave Runner LLC |
| 671-858 | Tamuning | Guam | -1 | Wave Runner LLC |
| 671-864 | Tamuning | Guam | -1 | Pulse Mobile LLC |
| 671-868 | Tamuning | Guam | -1 | Choice Phone LLC dba Iconn |
| 671-878 | Tamuning | Guam | -1 | Choice Phone LLC dba Iconn |
| 671-888 | Tamuning | Guam | -1 | Choice Phone LLC dba Iconn |
| 671-898 | Tamuning | Guam | -1 | Choice Phone LLC dba Iconn |
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