Area code 671

The area code 671 is the local telephone area code of the United States territory of Guam. It was created with the beginning of permissive dialing on July 1, 1997, replacing Guam's previous International Telecommunication Union country code 671, at the end of permissive dialing on July 1, 1998.

Origins

Prior to 1997, callers from the rest of the United States had to dial '011-671' and then the seven-digit telephone number to reach Guam, similar to international calls. As international calling rates began to fall in the more competitive destination countries during the 1990s, it became a considerable financial burden for people on the United States mainland to place calls to the United States territory of Guam, especially for those who were stationed in United States military bases there.

Calling costs

After Guam was added to the North American Numbering Plan, the Federal Communications Commission (FCC) regulated calls to and from Guam as "domestic", hence dramatically lowering the cost of these telephone calls. This change also opened up national toll-free numbers (as of April 2015, area codes 800, 888, 877, 866, 855 and 844) to callers from Guam, which became very popular with the advent of prepaid phone cards.

However, since no U.S. national mobile telephone carriers have a presence on Guam, cellular calls into Guam are not necessarily considered "domestic" or within the definition of "nationwide long distance".

The FCC's regulation of Guam as "domestic" has no legal effect for telephone carriers outside the United States, for whom Guam is often not a competitive destination. Therefore, calls from other countries inbound to Guam can still be relatively expensive, especially compared to outbound calls from Guam since Guam is now open to the U.S.-based phone card market through toll-free access.

Dialing

Within Guam, only the seven-digit phone number is necessary. When a person in Guam calls anywhere in the United States or Canada, one simply dials "1" and then the area code and phone number. For callers in the U.S. or Canada calling to Guam, one first dials '1-671', followed by the seven-digit phone number.

Prefixes

With a population of less than 200,000, [1] there is only a limited need for prefixes on Guam. Currently, less than 165 of the 800 possibilities are actually in use.

Here is a list of landline prefixes on Guam and their associated geographic locations:

gollark: From the article.
gollark: Rednet, while at first glance appearing to enhance security by being able to send messages to specific computer IDs, is susceptible to the issues of spoofing (in this case, pretending that one's ID differs from one's actual ID) and interception, as it is built on top of the modem API, which permits doing this using its lower-level access.
gollark: You don't need to "bypass" it, just listen to rednet.CHANNEL_REPEAT with modem.
gollark: I wrote some of this, it's useful.
gollark: https://wiki.computercraft.cc/Network_security

See also

References
  1. https://www.census.gov/newsroom/releases/archives/census_2000/cb01cn174.html
Guam area codes: 671
North: 670
West: Pacific Ocean area code 671 East: Pacific Ocean, 808
South: Pacific Ocean, country code +691 in Federated States of Micronesia
Hawaii area codes: 808
Northern Mariana Islands area codes: 670

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