Editing 999 (emergency telephone number) (section)

==United Kingdom==
[[File:Trefor emergency phone.jpg|thumb|right|An emergency phone on the [[Wales|Welsh]] coast at [[Trefor, Gwynedd|Trefor]] featuring 999. (Note the keypad missing digits 4 - 0, with no instruction on how to dial 999 from this phone.)]]
999 is the official emergency number for the United Kingdom, but calls are also accepted on the European Union emergency number, [[112 (emergency telephone number)|112]]. All calls are answered by 999 operators, and are always free.<ref>{{Cite web|url=https://www.gov.uk/call-charges|title=Call charges and phone numbers|website=GOV.UK|language=en|access-date=8 March 2019|archive-date=10 March 2019|archive-url=https://web.archive.org/web/20190310073313/https://www.gov.uk/call-charges|url-status=live}}</ref> Approximately 35 million 999/112 calls are made in the UK each year, with 74% from mobiles and 26% from landlines in 2022.<ref>{{Cite web |date=2022-06-24 |title=999 and 112: the UK's national emergency numbers |url=https://www.gov.uk/guidance/999-and-112-the-uks-national-emergency-numbers |access-date=2023-06-29 |website=GOV.UK |language=en |archive-date=29 June 2023 |archive-url=https://web.archive.org/web/20230629003031/https://www.gov.uk/guidance/999-and-112-the-uks-national-emergency-numbers |url-status=live }}</ref>

===Emergency services===
{{Pie chart|caption=Distribution of emergency calls between service ECC in the United Kingdom (based on 2022 data of 35 million 999/112 calls)
|label1=[[Emergency medical services in the United Kingdom|Ambulance]]
|value1=53 |color1=forestgreen
|label2=[[Law enforcement in the United Kingdom|Police]]
|value2=44 |color2=dodgerblue
|label3=[[Fire services in the United Kingdom|Fire]]
|value3=3 |color3=firebrick
|label4=[[His Majesty's Coastguard|Coastguard]]
|value4=<1 |color4=orange
}}
In the United Kingdom there are four emergency services which maintain full-time [[emergency control centre]]s (ECC), to which 999 emergency calls may be directly routed by emergency operators in telephone company operator assistance centres (OAC). These services are as follows, listed in the order of percentage of calls received:<ref>{{cite web |url=http://www.btplc.com/News/Articles/Showarticle.cfm?ArticleID=73487E0D-3881-4A16-8804-4E5B806F9AE1 |title=999 celebrates its 75th birthday |date=29 June 2012 |website=[[British Telecom]] |access-date=21 January 2019 |url-status=dead |archive-url=https://web.archive.org/web/20120717212444/http://www.btplc.com/News/Articles/Showarticle.cfm?ArticleID=73487E0D-3881-4A16-8804-4E5B806F9AE1 |archive-date=17 July 2012}}</ref>
* [[Emergency medical services in the United Kingdom|Ambulance]]
* [[Law enforcement in the United Kingdom|Police]]
* [[Fire services in the United Kingdom|Fire]]
* [[His Majesty's Coastguard|HM Coastguard]]

Other emergency services may also be reached through the 999 system, but do not maintain permanent emergency control centres. All of these emergency services are summoned through the ECC of one of the four principal services listed above:<ref>{{Cite web|url=https://www.sunderland.gov.uk/article/12674/Resilience|title=Resilience - Sunderland City Council|website=www.sunderland.gov.uk|access-date=29 August 2020}}</ref>
* [[Royal National Lifeboat Institution|Lifeboat]]<ref>{{cite web|url=https://rnli.org/safety/how-to-call-for-help-at-sea|publisher=RNLI|access-date=16 August 2020|title=How to call for help at Sea|archive-date=19 August 2020|archive-url=https://web.archive.org/web/20200819043303/https://rnli.org/safety/how-to-call-for-help-at-sea|url-status=live}}</ref>
* [[Mountain rescue in England and Wales|Mountain rescue]]<ref>{{cite web|url=https://www.mountain.rescue.org.uk/fact_file/fact-file-6-stay-safe-information/|title=How to stay safe|access-date=16 August 2020|publisher=Mountain Rescue England and Wales|archive-date=16 September 2020|archive-url=https://web.archive.org/web/20200916030926/https://www.mountain.rescue.org.uk/fact_file/fact-file-6-stay-safe-information/|url-status=live}}</ref><ref>{{Cite web|url=https://www.burnleyexpress.net/lifestyle/outdoors/no-challenge-too-high-or-deep-rossendale-and-pendle-mountain-rescue-team-our-fourth-emergency-service-693695|title=No challenge too high or deep for Rossendale and Pendle Mountain Rescue Team - our fourth emergency service|website=www.burnleyexpress.net|date=24 April 2019|access-date=30 August 2020|archive-date=16 September 2020|archive-url=https://web.archive.org/web/20200916053054/https://www.burnleyexpress.net/lifestyle/outdoors/no-challenge-too-high-or-deep-rossendale-and-pendle-mountain-rescue-team-our-fourth-emergency-service-693695|url-status=live}}</ref><ref>{{Cite web|work=Scottish Mountain Rescue|access-date=6 September 2020|url=https://www.scottishmountainrescue.org/what-happens-on-a-callout/|title=What happens on a call out?|quote=In an emergency, if you need to call out Mountain Rescue phone 999 and ask for Police and then Mountain Rescue or Cave Rescue if applicable.|archive-date=30 August 2020|archive-url=https://web.archive.org/web/20200830102954/https://www.scottishmountainrescue.org/what-happens-on-a-callout/|url-status=live}}</ref>
* [[Cave rescue#United Kingdom|Cave rescue]]<ref>{{cite web|url=http://www.cavinguk.co.uk/info/rescue.html|title=Calling out Cave Rescue|publisher=Cave Rescue Organisation|access-date=16 August 2020|archive-date=29 January 2022|archive-url=https://web.archive.org/web/20220129111923/http://www.cavinguk.co.uk/info/rescue.html|url-status=live}}</ref><ref>{{Cite web|url=https://www.caverescue.org.uk/about-cave-rescue/how-cave-rescue-works/|title=How Cave Rescue Works – British Cave Rescue Council|access-date=30 August 2020|archive-date=7 August 2020|archive-url=https://web.archive.org/web/20200807010450/https://www.caverescue.org.uk/about-cave-rescue/how-cave-rescue-works/|url-status=live}}</ref>
* [[Mine rescue]]
* [[Bomb disposal]] (provided by [[HM Armed Forces]])

===History===
First introduced in the [[London]] area on 30 June 1937,<ref>[https://www.newspapers.com/article/evening-standard-999-british-emergenc/90389961/ "Dial 999 If Your Call Is Urgent"], ''Evening Standard'' (London), 30 June 1937, p.22</ref> the UK's 999 number is the world's oldest emergency call telephone service. The system was introduced following a [[house fire]] in [[Wimpole Street]] on 10 November 1935, in which five women were killed.<ref name="women.timesonline.co.uk">{{cite news |url=http://women.timesonline.co.uk/tol/life_and_style/women/the_way_we_live/article6826410.ece |title=999: can somebody help? It's an emergency |newspaper=[[The Times]] |date=9 September 2009 |access-date=11 September 2009 |location=London |archive-date=15 June 2011 |archive-url=https://web.archive.org/web/20110615172721/http://women.timesonline.co.uk/tol/life_and_style/women/the_way_we_live/article6826410.ece |url-status=dead }}</ref> A neighbour had tried to telephone the fire brigade and was so outraged at being held in a queue by the Welbeck telephone exchange that he wrote a letter to the editor of ''[[The Times]]'',<ref>{{cite news |url=http://archive.timesonline.co.uk/tol/viewArticle.arc?articleId=ARCHIVE-The_Times-1935-11-11-13-013&pageId=ARCHIVE-The_Times-1935-11-11-13 |title=The fire in Wimpole Street |newspaper=[[The Times]] |date=11 November 1935 |access-date=11 September 2009 |location=London |url-status=dead }}</ref> which prompted a government inquiry.<ref name="women.timesonline.co.uk"/>

The initial scheme covered a {{convert|12|mi|km|adj=on}} radius around [[Oxford Circus]]<ref name=Y999>{{cite web |url=http://news.bbc.co.uk/local/london/hi/people_and_places/history/newsid_8675000/8675199.stm |title=Why 999 for an emergency? |first=Gary |last=Holland |website=BBC History |date=13 May 2010 |access-date=1 July 2012 |archive-date=19 July 2013 |archive-url=https://web.archive.org/web/20130719095000/http://news.bbc.co.uk/local/london/hi/people_and_places/history/newsid_8675000/8675199.stm |url-status=live }}</ref> and the public were advised only to use it in an ongoing emergency if "for instance, the man in the flat next to yours is murdering his wife or you have seen a heavily masked cat burglar peering round the stack pipe of the local bank building."<ref name=beeb9>{{cite web |url=https://www.bbc.co.uk/news/magazine-18520121 |title=Dial 999: 75 years of emergency phone calls |website=BBC News |first=Keith |last=Moore |date=30 June 2012 |access-date=21 July 2018 |archive-date=21 August 2018 |archive-url=https://web.archive.org/web/20180821043324/https://www.bbc.co.uk/news/magazine-18520121 |url-status=live }}</ref> The first arrest – for burglary – took place a week later and the scheme was extended to major cities after [[World War II]] and then to the whole of the UK in 1976.<ref name=beeb9/>

The 9-9-9 format was chosen based on the 'button A' and 'button B' design of pre-payment coin-operated public [[payphone]]s in wide use (first introduced in 1925) which could be easily modified to allow free use of the 9 digit on the [[rotary dial]] in addition to the 0 digit (then used to call the operator), without allowing free use of numbers involving other digits; other combinations of free call 9 and 0 were later used for more purposes, including multiples of 9 (to access exchanges before [[subscriber trunk dialling]] came into use) as a fail-safe for attempted emergency calls, e.g. 9 or 99, reaching at least an operator.<ref>{{cite book |last=Atkinson |title=Telephony, Volume 2 |year=1950 |publisher=Pitman}}</ref>
[[File:Rotarydial.JPG|right|thumb|100px|US-style [[rotary phone]]]]
The choice of 999 was fortunate for accessibility, because in the dark or in dense smoke 999 could be dialled by placing a finger one hole away from the dial stop (see the articles on [[rotary dial]] and [[GPO telephones]]) and rotating the dial to the full extent three times. This enables all users including the visually impaired to easily dial the emergency number. It is also the case that it is relatively easy for 111, and other low-number sequences, to be called accidentally, including when transmission wires making momentary contact produce a pulse similar to dialling (e.g. when overhead cables touch in high winds).<ref>{{cite web |url=http://www.btplc.com/News/Articles/ShowArticle.cfm?ArticleID=6e55cb12-8c0c-417f-b68c-6a7f62b1d8c8 |title=999 celebrates its 70th birthday |date=29 June 2007 |website=[[BT plc]] |access-date=2 March 2009 |archive-url=https://web.archive.org/web/20090302014433/http://www.btplc.com/News/Articles/ShowArticle.cfm?ArticleID=6e55cb12-8c0c-417f-b68c-6a7f62b1d8c8 |archive-date=2 March 2009}}</ref><ref>{{cite web |url=http://news.bbc.co.uk/1/hi/magazine/7748046.stm |title=When are silent 999 calls cut off? |date=26 November 2008 |website=BBC News |access-date=26 November 2008 |archive-url=https://web.archive.org/web/20081203053715/http://news.bbc.co.uk/1/hi/magazine/7748046.stm| archive-date=3 December 2008| url-status= live}}</ref>

Hoax calls and improper use are a problem. For these reasons, there are frequent public information campaigns in the UK on the correct use of the 999 system.<ref>{{cite web |last1=Homer |first1=Alex |title=When do 999 calls become a nuisance? |url=https://www.bbc.co.uk/news/uk-england-28562807 |website=BBC News |access-date=28 July 2020 |date=7 August 2014 |archive-date=28 July 2020 |archive-url=https://web.archive.org/web/20200728150322/https://www.bbc.co.uk/news/uk-england-28562807 |url-status=live }}</ref>

Alternative three-digit numbers for non-emergency calls have also been introduced in recent years. [[Single Non-Emergency Number|101]] was introduced for non-urgent calls to Police in England and Wales<ref name="ho101">{{cite web |url=http://www.101.gov.uk/ |title=Welcome to 101 |website=[[Home Office]] |access-date=22 June 2014 |archive-date=9 February 2010 |archive-url=https://web.archive.org/web/20100209040746/http://www.101.gov.uk/ |url-status=live }}</ref> and later extended to Scotland<ref name="scot101">{{cite web |url=http://www.scotland.police.uk/whats-happening/campaigns/2013/101-non-emergency/ |title=101 |website=Police Scotland |access-date=22 June 2014 |archive-date=14 June 2017 |archive-url=https://web.archive.org/web/20170614235405/http://www.scotland.police.uk/whats-happening/campaigns/2013/101-non-emergency/ |url-status=dead }}</ref> and Northern Ireland.<ref name="bbc-26716051">{{cite web |url=https://www.bbc.co.uk/news/uk-northern-ireland-26716051 |title=New 101 number for non-emergency PSNI calls |website=BBC News |date=14 March 2014 |access-date=21 July 2018 |archive-date=10 November 2018 |archive-url=https://web.archive.org/web/20181110151853/https://www.bbc.co.uk/news/uk-northern-ireland-26716051 |url-status=live }}</ref>

Trials of [[NHS 111|111]] as a number to access health services in the UK for urgent but not life-threatening cases began in England in 2010. The main roll-out was originally meant to be finished by April 2013<ref>{{cite web |title=Q&A: NHS 111 |url=https://www.bbc.co.uk/news/health-22370621 |website=BBC News |access-date=28 July 2020 |date=29 July 2013 |archive-date=28 July 2020 |archive-url=https://web.archive.org/web/20200728163712/https://www.bbc.co.uk/news/health-22370621 |url-status=live }}</ref> but was not completed until February 2014.<ref>{{cite web |title=Retendering NHS 111 contracts could cost millions |url=https://www.theguardian.com/society/2014/jan/02/retendering-nhs-111-contracts-cost-millions |website=The Guardian |access-date=28 July 2020 |language=en |date=2 January 2014 |archive-date=28 July 2020 |archive-url=https://web.archive.org/web/20200728144806/https://www.theguardian.com/society/2014/jan/02/retendering-nhs-111-contracts-cost-millions |url-status=live }}</ref> In Scotland, the NHS24 service moved from 0845 424 2424 to 111 on 29 April 2014.<ref name="new111">{{cite web |url=http://www.nhs24.com/111 |title=New 111 telephone number |website=NHS 24 |date=29 April 2014 |url-status=live |archive-date=29 April 2014 |archive-url=https://web.archive.org/web/20140429111226/http://www.nhs24.com/111}}</ref><ref name="bbc111">{{cite web |url=https://www.bbc.co.uk/news/uk-scotland-scotland-politics-27198513 |title=New 111 freephone number for NHS 24 helpline |website=BBC News |date=29 April 2014 |url-status=live |archive-date=29 April 2014 |archive-url=https://web.archive.org/web/20140429230321/http://www.bbc.co.uk/news/uk-scotland-scotland-politics-27198513}}</ref> NHS 111 Wales (formally NHS Direct Wales) can now be accessed through the 111 number.<ref name=":1">{{Cite news |last=Gregory |first=Rhys |date=5 April 2022 |title=NHS 111 service now available across Wales |work=Wales 24/7 |url=https://www.wales247.co.uk/nhs-111-service-now-available-across-wales |access-date=6 October 2022 |archive-date=5 April 2022 |archive-url=https://web.archive.org/web/20220405092519/https://www.wales247.co.uk/nhs-111-service-now-available-across-wales |url-status=live }}</ref> It previously used 0845 46 47 but the rollout of 111 was completed,<ref name=":1" /> following trials starting in 2016 <ref>{{Cite web|url=https://www.nhsdirect.wales.nhs.uk/contactus/|title=NHS Direct Wales - Contact Us|website=www.nhsdirect.wales.nhs.uk|access-date=2020-04-21|archive-date=7 March 2020|archive-url=https://web.archive.org/web/20200307154910/https://www.nhsdirect.wales.nhs.uk/contactus/|url-status=live}}</ref>

In 2008–2009, Nottinghamshire Police ran a successful pilot of ''Pegasus'', a database containing the details of people with physical and learning disabilities or mental health problems, who have registered with the force because their disabilities make it difficult for them to give spoken details when calling the police. Those registered on the database are issued with a personal identification number (PIN) that can be used in two ways. By phone – either 999 or the force's non-emergency 101 number can be used – once a person is put through to the control room, they only need to say "Pegasus" and their PIN. Their details can then be retrieved from the database and the caller can quickly get on with explaining why they have called. In person – the ''Pegasus'' PIN can be told or shown to a police officer. Pegasus is also used by the City of London Police, Dyfed Powys Police, Surrey Police & Lincolnshire Police.

The use of push-button telephones can cause problems,<ref>{{cite web |url=http://news.bbc.co.uk/1/hi/uk/684804.stm |title=Mobiles blamed for emergency calls |website=[[BBC News Online]] |date=21 March 2000 |access-date=12 December 2008 |archive-date=4 March 2003 |archive-url=https://web.archive.org/web/20030304075038/http://news.bbc.co.uk/1/hi/uk/684804.stm |url-status=live }}</ref> because it is easy to push the same button repeatedly by accident, e.g. by objects in the same pocket as the telephone (termed '[[pocket dialling]]') or by children playing with it. This problem is less of a concern with emergency numbers that use two different digits, such as 112 and 911, although on landlines 112 suffers much of the same risk of false generation as the 111 code which was considered and rejected when the original choice of 999 was made.

The pan-European 112 code was introduced in the UK in April 1995<ref>{{cite web |url=http://www.ofcom.org.uk/static/archive/oftel/publications/numbering/acc0500.htm#Annex%20C |title=Access Codes: Options for the future |website=[[Oftel]] |date=May 2000 |access-date=31 July 2012 |archive-date=13 July 2012 |archive-url=https://web.archive.org/web/20120713201051/http://www.ofcom.org.uk/static/archive/oftel/publications/numbering/acc0500.htm#Annex%20C |url-status=live }}</ref> with little publicity. It connects to existing 999 circuits. The [[GSM]] standard mandates that a user can dial 112 without unlocking the keypad, which can save time but also causes some accidental calls.

Silent solution 55 is the name given to the initiative that allows people to call 999 when they are not able to speak. If the caller does not initially respond to opening questions, the operator will then ask the caller to cough, tap their handset or make another audible sign that indicates they are in need of emergency assistance. In some instances where there is still no clear response, the call may be put through to an automated system which asks the caller to press 55 if in danger.<ref>{{Cite web |url=https://www.westyorkshire.police.uk/contact-us/what-happens-when-you-dial-999/silent-999-calls |title=Silent 999 Calls |website=West Yorkshire Police |access-date=6 June 2017 |archive-date=3 September 2017 |archive-url=https://web.archive.org/web/20170903203201/https://www.westyorkshire.police.uk/contact-us/what-happens-when-you-dial-999/silent-999-calls |url-status=live }}</ref>

===Procedure===
999 or 112 is used to contact the emergency services upon witnessing or being involved in an [[emergency]]. In the United Kingdom, the numbers 999 and 112 both connect to the same service, and there is no priority or charge for either of them. Calls to [[911 (emergency number)|911]], [[North America|North America's]] emergency number, may be transferred to the 999 call system if the call is made within the United Kingdom from a mobile phone.

An emergency can be:
* A person in need of immediate medical assistance, or an immediate danger to life
* Suspicion that a [[crime]] is in progress, or that an offender is in the area
* Structure on fire
* Another serious incident which needs immediate emergency service attendance

All telecoms providers operating in the UK are obliged as part of their licence agreement to provide a free of charge emergency operator service. {{Asof|2014}} emergency calls made on any network in the UK are handled by [[BT Group|BT]]. BT operates seven call centres nationally to take 999/112 calls.
[[File:Flowchart for a 999 emergency call.svg|thumb|A flowchart for a 999 call]]
When 999 or 112 is dialled an operator will answer the call and ask, "Emergency. Which service?"<ref>{{Cite web |url=https://www.londonambulance.nhs.uk/calling_999/what_happens_when_you_call_999.aspx |title=What happens when you call 999 |date=8 July 2013 |website=London Ambulance Service |access-date=23 March 2016 |archive-date=8 January 2018 |archive-url=https://web.archive.org/web/20180108062648/https://www.londonambulance.nhs.uk/calling_999/what_happens_when_you_call_999.aspx}}</ref> Previously operators asked "Which service do you require?" (approximately up to the mid-90s).

The operator will then transfer the call to the appropriate service's own call-taker. If the caller is unsure as to which service they require, the operator will transfer the call to the police, and if an incident requires more than one service, for instance a road [[traffic accident]] with injuries and trapped people, one service will alert the others. (The operator has to contact each service individually, whether or not the caller remains on the line.) The caller will be connected to the service which covers the area that they are (or appear to be) calling from.

On 6 October 1998, [[BT Group|BT]] introduced a new system whereby all the information about the location of the calling telephone was transmitted electronically to the relevant service rather than having to be read out (with the possibility of errors). This system is called EISEC (Enhanced Information Service for Emergency Calls). Before it, the operator had to start the connection to the emergency service control room by stating their own location, then the caller's telephone number, e.g. "Bangor connecting 01248 300 000". It was common for the caller to be confused why the operator was talking to the emergency service, and frequently talked over the operator. Only around half of the emergency authorities have EISEC, although the number is ever increasing.

Although the initial response to all 999 calls is in English, callers who reply in Welsh are transferred to the Bangor control room where the call will be taken by Welsh-speaking operators.<ref>{{cite web |url=https://www.btplc.com/Thegroup/BTUKandWorldwide/BTRegions/Wales/WelshLanguagePolicy/WelshLanguagePolicy.htm |title=Welsh Language Policy |website=BT plc |access-date=11 September 2018 |archive-date=12 September 2018 |archive-url=https://web.archive.org/web/20180912170144/https://www.btplc.com/Thegroup/BTUKandWorldwide/BTRegions/Wales/WelshLanguagePolicy/WelshLanguagePolicy.htm |url-status=live }}</ref><ref>{{cite web|url=https://newsroom.bt.com/the-999-service-is-80-years-old-today---and-more-than-48-million-calls-are-handled-from-the-bangor-call-centre-in-north-wales/|title=The 999 service is 80 years old today - and more than 4.8 million calls are handled from the Bangor call centre in North Wales|date=30 June 2017|access-date=18 February 2023|publisher=BT|archive-date=19 February 2023|archive-url=https://web.archive.org/web/20230219235517/https://newsroom.bt.com/the-999-service-is-80-years-old-today---and-more-than-48-million-calls-are-handled-from-the-bangor-call-centre-in-north-wales/|url-status=live}}</ref>

The rooms in which operators work are called operator assistance centres (OACs). There are six BT OACs.<ref>{{cite web|url=https://www.edinburghnews.scotsman.com/read-this/999-call-operators-strike-today-over-bt-pay-3869352|title=999 call operators strike today over BT pay - how emergency calls will be affected|date=6 October 2022|publisher=Edinburgh Evening News|access-date=20 February 2023|archive-date=20 February 2023|archive-url=https://web.archive.org/web/20230220085000/https://www.edinburghnews.scotsman.com/read-this/999-call-operators-strike-today-over-bt-pay-3869352|url-status=live}}</ref> The rooms in which emergency response operators work are called [[emergency control centre]]s (ECCs) and are operated by local authorities.

In some situations there may be specific instructions on nearby signs to notify some other authority of an emergency before calling 999. For example, railway bridges may carry signs advising that if a road vehicle strikes the bridge the railway authority (usually [[Network Rail]]) should be called first on a given number. Network Rail has its own procedures to alert trains to the emergency and to stop them if necessary. The instructions on the signs state 999 should then be dialled and that the police should be requested.

Access to the 999/112 service is provided for the hearing-impaired via [[Telecommunications device for the deaf|Textphone]] and use of the Text Relay service, run by BT to cover all telephone providers, and previously known as the [[Royal National Institute for Deaf People|RNID]] "Typetalk" relay service. The number is 18000.

999 is also accessible via [[SMS]] for pre-registered users.{{efn|[http://www.emergencysms.org.uk/how_to_send_text.php www.emergencySMS.org.uk Official website]}} The service is open for anyone to register and works with all major providers in the UK.<ref>{{cite web |title=Questions and answers |url=http://www.emergencysms.org.uk/questions_and_answers.php |website=Emergency SMS |access-date=22 February 2017 |archive-date=23 February 2017 |archive-url=https://web.archive.org/web/20170223042926/http://www.emergencysms.org.uk/questions_and_answers.php |url-status=live }}</ref>

===Location===
The caller's location will not be passed onto the emergency services immediately, but it is possible to trace both landline and mobile telephone numbers with the BT operator; the former can be traced to an address. The latter can be immediately traced to a [[grid reference]] according to the [[transmitter]] being used.<ref>{{cite web |title=Enhanced 999 facility for mobile phones |url=http://media.ofcom.org.uk/2004/01/15/enhanced-999-facility-for-mobile-phones/ |date=15 January 2004 |website=Ofcom |access-date=7 June 2012 |archive-url=https://web.archive.org/web/20130606191708/http://media.ofcom.org.uk/2004/01/15/enhanced-999-facility-for-mobile-phones/|archive-date=6 June 2013 |url-status=dead }}</ref> However, this is only accurate to a certain wide area – for more specific traces, authority must be sought and an expensive operation can be conducted to trace the mobile phone to within a few metres. A number of smartphone apps can now be downloaded that assist with caller location by using the smartphone's satellite navigation features.

Since 2014, smartphones which implement [[Advanced Mobile Location]] will detect that an emergency call is being placed, and use any available location services (WiFi or GPS based location) to send an emergency SMS containing an identifier for the call and the phone's location, accurate to 30 metres.<ref>{{Cite web|url=https://www.computerweekly.com/news/2240234212/Advanced-Mobile-Location-pinpoints-999-calls-to-inside-30m|title=Advanced Mobile Location pinpoints 999 calls to within 30m|website=ComputerWeekly.com|language=en|access-date=4 May 2019|archive-date=22 March 2019|archive-url=https://web.archive.org/web/20190322033108/https://www.computerweekly.com/news/2240234212/Advanced-Mobile-Location-pinpoints-999-calls-to-inside-30m|url-status=live}}</ref> This is intended to be received by the mobile operator whilst the call is in progress.<ref>{{cite web |title=Location information for emergency calls from mobile phones |url=http://stakeholders.ofcom.org.uk/binaries/consultations/emergency-mobiles-cfi/statement/Emergency_Mobile_Location_Information_Statement.pdf |website=Ofcom |access-date=2 January 2016 |archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304095801/http://stakeholders.ofcom.org.uk/binaries/consultations/emergency-mobiles-cfi/statement/Emergency_Mobile_Location_Information_Statement.pdf |url-status=live }}</ref>

On some occasions callers will be put through to the wrong area service – this is called a "misrouted nines".<ref>{{Cite web|title=Delayed or inaccurate mobilising of resources - OPS {{!}} NFCC CPO|url=https://www.ukfrs.com/guidance/search/delayed-or-inaccurate-mobilising-resources|access-date=2021-09-20|website=www.ukfrs.com|archive-date=20 September 2021|archive-url=https://web.archive.org/web/20210920212411/https://www.ukfrs.com/guidance/search/delayed-or-inaccurate-mobilising-resources|url-status=live}}</ref> The most common reason for this is when a mobile phone calls 999 and is using a radio transmitter that is located in another force area; most frequently these are calls that are made within a few miles of a border. Upon establishing the incident location, the emergency service operator will relay the information to the responsible force for their dispatch. In most areas, forces will respond to incidents just beyond their border if they could get there quicker, assist, and then hand over to other forces when they arrive.

On strategic routes like almost all motorways and some major A roads in the United Kingdom, [[National Highways]] have placed blue [[driver location signs]] with the location printed on them, at approximately 500-metre intervals. Although emergency [[Emergency telephone|SOS phones]] are placed along the [[Shoulder (road)|hard shoulder]] on all motorways (and in emergency refuge areas on [[smart motorway]]s) which automatically send location information to the National Highways regional control centre (RCC), most people involved in a road emergency call from their mobile phones and so need another way to identify their location. These signs contain a code which can be given to the emergency operator or the RCC. For example, a sign may say "M1 A 100.5". This translates as the M1 motorway, on the "A" carriageway, at 100.5 kilometres from the M1's nominal start at [[Staples Corner]].<ref name=":0">{{Cite web |url=https://www.theaa.com/breakdown-cover/advice/driver-location-signs |title=Driver location signs |website=[[The Automobile Association]] |access-date=25 July 2018 |archive-date=25 July 2018 |archive-url=https://web.archive.org/web/20180725214555/https://www.theaa.com/breakdown-cover/advice/driver-location-signs |url-status=live }}</ref> The "A" and "B" carriageways are designated by Highways England to each carriageway, dependent upon which direction it travels; these normally refer to whether the carriageway goes "Away from London" or "Back to London". On circular motorways like the [[M25 motorway|London Orbital M25]] and [[M60 motorway|M60 Manchester Outer Ring Road]], the clockwise carriageway is the A carriageway and the anti-clockwise carriageway is the B carriageway. Letters J, K, L and M refer to slip roads at junctions. These signs are in addition to the pre-existing 100m distance marker posts alongside the carriageway.<ref name=":0" />

===Abandoned and hoax calls===
An abandoned call is when a caller, intentionally or otherwise, rings 999 and then ends the call or stays silent. Abandoned calls are filtered by emergency operators BT and Cable & Wireless, and are either disconnected or passed on to police.<ref>{{Cite web |url=https://www.herts.police.uk/contact_us/silent_999_calls.aspx |title=Silent 999 Calls |website=[[Hertfordshire Constabulary]] |access-date=1 June 2017 |archive-url=https://web.archive.org/web/20170606140719/https://www.herts.police.uk/contact_us/silent_999_calls.aspx |archive-date=6 June 2017 |url-status=dead }}</ref>

They are normally disconnected by the operator repeating "Emergency. Which service?", then if no response is given, the operator will say "Do you need police, fire or ambulance?". If there is still no response, the operator will sometimes ask the caller to press the keypad or make a noise if they need assistance.<ref>{{Cite news|url=https://www.thamesvalley.police.uk/police-forces/thames-valley-police/areas/advice/silent-solution---999-and-55/|title=Silent Solution - Thames Valley Police'|date=16 July 2021|access-date=16 July 2021|language=en-GB|archive-date=16 July 2021|archive-url=https://web.archive.org/web/20210716130754/https://www.thamesvalley.police.uk/police-forces/thames-valley-police/areas/advice/silent-solution---999-and-55/|url-status=live}}</ref> If no response is given, they will confirm they are clearing the line.

For abandoned calls, if the caller requests the police and the call is routed to police and then the line is dropped, either while waiting for connection or on the line with police, they are checked by police and called back. If there is no answer, the police service are likely to attend and if the line is disconnected without the caller telling the operator which service they need, they then make a decision to filter the call to police (if suspicious background noise) or clear the line.{{citation needed|date=June 2020}}

The most common reasons for abandoned calls include:{{citation needed|date=June 2020}}
* [[Pocket dialling|Accidental dialling]] of 999 on mobile phones. As a GSM standard, mobile phones still allow emergency calls to be made even with the keypad locked.
* Faulty phone lines.
* Believing [[999 phone charging myth|an urban myth that says dialling 999 charges mobile phone batteries]].