Editing Cell site (section)

===Geolocation===

Cellular [[geolocation]] is less precise than by [[GNSS]] (e.g. GPS), but it is available to devices that do not have [[GPS receiver]]s and where the GNSS is not available. The precision of this system varies and is highest where advanced forward link methods are possible and is lowest where only a single cell site can be reached, in which case the location is only known to be within the coverage of that site.

An advanced forward link is where a device is within range of at least three cell sites and where the carrier has implemented timing system use.

Another method is using [[angle of arrival]] (AoA) and it occurs when the device is in range of at least two cell sites, produces intermediate precision. [[Assisted GPS]] uses both satellite and cell phone signals.

In the United States, for emergency calling service using location data (locally called "[[Enhanced 911]]"), it was required that at least 95% of cellular phones in use on 31 December 2005 support such service. Many carriers missed this deadline and were fined by the [[Federal Communications Commission]].<ref>{{Cite web|url=https://www.fiercewireless.com/wireless/sprint-alltel-usc-fined-for-missed-e911-deadline|title=Sprint, Alltel, USC fined for missed e911 deadline|website=FierceWireless|date=31 August 2007|access-date=4 December 2019|archive-date=29 November 2020|archive-url=https://web.archive.org/web/20201129050859/https://www.fiercewireless.com/wireless/sprint-alltel-usc-fined-for-missed-e911-deadline|url-status=live}}</ref>