Advanced Mobile Location (AML) is a free-of-charge emergency location-based service (LBS) available on smartphones that, when a caller dials the local (in country) short dial emergency telephone number, sends the best available geolocation of the caller to a dedicated end-point, usually a Public Safety Answering Point, making the location of the caller available to emergency call takers in real-time.
[1] AML is supported in many countries, and by all smartphones running recent versions of Android or iOS, although it can be disabled in user settings.
[3] AML was developed in the United Kingdom in 2014 by British Telecom, EE Limited, and HTC as a solution to problematic caller location in emergencies.
[5] The services use either a global navigation satellite system or WiFi depending on which one is better at the given moment.
[6] Google announced in July 2016 that all Android phones running version 2.3.7, Gingerbread (released in December 2010) or later include AML.