999 (emergency telephone number) 999 (emergency telephone number) 999 is an official emergency telephone number in a number of countries which allows the caller to contact emergency services for urgent assistance. countries and territories using the number include bahrain, bangladesh, botswana, eswatini, ghana, guernsey, hong kong, ireland, isle of man, jersey, kenya, macau, malaysia, mauritius, poland, qatar, sudan, saudi arabia, singapore, trinidad and tobago, seychelles, uganda, the united arab emirates, the united kingdom, and zimbabwe. a sign on a beach in whitstable, united kingdom, advising readers to dial 999 and to request for the coastguard in the event of an emergency united kingdom an emergency phone on the welsh coast at trefor featuring 999 999 is the official emergency number for the united kingdom, but calls are also accepted on the european union emergency number, 112. all calls are answered by 999 operators, and are always free. emergency services distribution of emergency calls between service eccs in the united kingdom (based on 2011 data) police (52%) ambulance (41%) fire (6%) coastguard (1%) in the united kingdom there are four emergency services which maintain full-time emergency control centres (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: police ambulance fire 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: lifeboat mountain rescue cave rescue mine rescue bomb disposal (provided by hm armed forces) history first introduced in the london area on 30 june 1937, 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. 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, which prompted a government inquiry. the initial scheme covered a 12-mile (19 km) radius around oxford circus and the public were advised only to use it in 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." 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. the 9-9-9 format was chosen based on the 'button a' and 'button b' design of pre-payment coin-operated public payphones 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. 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). 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. alternative three-digit numbers for non-emergency calls have also been introduced in recent years. 101 was introduced for non-urgent calls to police in england and wales and later extended to scotland and northern ireland. trials of 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 but was not completed until february 2014. in scotland, the nhs24 service moved from 0845 424 2424 to 111 on 29 april 2014. nhs 111 wales (formally nhs direct wales) can now be accessed through the 111 number. it previously used 0845 46 47 but the rollout of 111 was completed, following trials starting in 2016 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, 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 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. 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, 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 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. as of 2014 emergency calls made on any network in the uk are handled by bt. a flowchart for a 999 call when 999 or 112 is dialled an operator will answer the call and ask, "emergency. which service?" 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 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. the rooms in which operators work are called operator assistance centres (oacs). there are six bt oacs. the rooms in which emergency response operators work are called emergency control centres (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 textphone and use of the text relay service, run by bt to cover all telephone providers, and previously known as the rnid "typetalk" relay service. the number is 18000. 999 is also accessible via sms for pre-registered users. the service is open for anyone to register and works with all major providers in the uk. 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. 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 meters. this is intended to be received by the mobile operator whilst the call is in progress. on some occasions callers will be put through to the wrong area service – this is called a "misrouted nines". the most common reason for this is when a mobile phone calls 999 and is using a radio transmitter that is located in another