Editing Smartphone (section)

====Rare sensors====
Samsung equips their flagship smartphones since the 2014 [[Galaxy S5]] and [[Galaxy Note 4]] with a [[heart rate]] sensor to assist in fitness-related uses and act as a shutter key for the front-facing camera.<ref>{{Cite web|date=2014-12-25|title=How to Use Heart Rate Sensor on Note 4 as a Shutter Button|url=https://androidwidgetcenter.com/android-tips/use-heart-rate-sensor-note-4-shutter-button/|access-date=2021-04-02|website=Android Widget Center|language=en |archive-url=https://web.archive.org/web/20210615163525/https://androidwidgetcenter.com/android-tips/use-heart-rate-sensor-note-4-shutter-button/ |archive-date=2021-06-15 |url-status=dead}}</ref>

So far, only the 2013 [[Samsung Galaxy S4]] and [[Samsung Galaxy Note 3|Note 3]] are equipped with an [[thermometer|ambient temperature sensor]] and a [[hygrometer|humidity sensor]], and only the [[Samsung Galaxy Note 4|Note 4]] with an [[ultraviolet]] radiation sensor which could warn the user about excessive exposure.<ref>{{Cite web|last=|date=2013-04-10|title=Hidden innovation in the Galaxy S4|url=https://www.sammobile.com/2013/04/10/hidden-innovation-in-the-galaxy-s4/|access-date=|website=SamMobile|language=en-US}}</ref><ref>{{Cite web|last=S|first=Ray|title=Playing with the Note 4's UV and SpO2 sensors|url=https://www.phonearena.com/news/Playing-with-the-Note-4s-UV-and-SpO2-sensors_id60358|access-date=2021-04-02|website=Phone Arena|date=September 6, 2014 |language=en-US}}</ref>

A rear infrared [[laser]] beam for distance measurement can enable [[time-of-flight camera]] functionality with accelerated [[autofocus]], as implemented on select LG mobile phones starting with [[LG G3]] and [[LG V10]].

Due to their currently rare occurrence among smartphones, not much software to utilize these sensors has been developed yet.