Area code 406

Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's only area code since area codes were created in 1947.

Area code 250Area code 403Area code 701Area code 605Area code 307Area codes 208 and 986
Map of Montana area code in blue (with border states and provinces)

As of 2013, there were 1.7 million lines served by 47 carriers; all but two wireline providers support local number portability (the exceptions are small rural independents Hot Springs Telephone Company and Northern Telephone Cooperative). Sufficient available codes for new exchanges in the 406 area code exist to meet anticipated demand until 2027; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.[1]

Exchanges in area code 406

Use by Google

On December 10, 2008, Google's Gmail Blog announced that SMS messages could be sent from inside Gmail. The messages are sent from numbers in the 406 area code. Each number is unique and can be bookmarked for replies or future use.[8]

Google also employs the use of area code 406 for the assignment of reply-to or callback numbers for Google Voice's customers' contacts.

gollark: Skynet does application-level pings, the websocket ping frames are kind of annoying.
gollark: The issue with the websocket protocol-level ping is that neither JS nor CC can actually see if one was received recently, as far as I can tell.
gollark: Yes, skynet does that, but mostly so it can detect disconnected clients itself and obliterate them rapidly.
gollark: From my experience, nginx and such will kill websocket connections if they're without activity for a bit by default.
gollark: * socket read timeout

References
  1. "Montana PSC Granted Authority to Implement Mandatory Number Pooling". fcc.gov. 12 December 2015. Archived from the original on 10 December 2017. Retrieved 7 May 2018.
  2. North Parkman is served from wire centre DNRHWYMARS1 Archived 2014-10-19 at the Wayback Machine in Sheridan, WY
  3. Ridge is served from HLTTWYXCRS1 Archived 2014-10-19 at the Wayback Machine Hulett, WY
  4. Silvertip is served from POWLWYMARS1 Archived 2014-10-19 at the Wayback Machine Powell, WY
  5. West Beach is served from BECHNDXADS1 Archived 2014-10-19 at the Wayback Machine in Beach, ND
  6. West Camp Crook is served from CMCRSDXARL0 Archived 2014-10-19 at the Wayback Machine in Camp Crook, SD
  7. West Squaw Gap is served from SQGPNDXARS5 Archived 2014-10-19 at the Wayback Machine Squaw Gap, ND
  8. Official GMail Blog (10 December 2008). "Really new in Labs this time: SMS Text Messaging for chat". Archived from the original on 4 March 2011. Retrieved 5 March 2011.

See also
Montana area codes: 406
North: 403/587/825, 250/778/236/672, 306/639
West: 208/986 406 East: 605, 701
South: 208/986, 307
Alberta area codes: 403, 587/825, 780
British Columbia area codes: 236/672/778, 250, 604
Saskatchewan area codes: 306, 639
Idaho area codes: 208/986
North Dakota area codes: 701
South Dakota area codes: 605
Wyoming area codes: 307
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