Editing Magnetometer (section)

===Mobile phones===
[[File:Motorola Xoom - AKM Semiconductor AKM8975-1693.jpg|thumb|Tri-axis Electronic Magnetometer by [[AKM Semiconductor, Inc.|AKM Semiconductor]], inside [[Motorola Xoom]]]]

Many smartphones contain miniaturized [[microelectromechanical systems]] (MEMS) magnetometers which are used to detect magnetic field strength and are used as [[compass]]es. The iPhone 3GS has a magnetometer, a magnetoresistive permalloy sensor, the AN-203 produced by Honeywell.<ref>{{cite book|last=Allan|first=Alasdair|chapter=5. Using the magnetometer |title=Basic sensors in iOS|date=2011|publisher=O'Reilly|location=Sebastopol, CA|isbn=978-1-4493-1542-9|pages=57–70|edition=1st}}</ref> In 2009, the price of three-axis magnetometers dipped below US$1 per device and dropped rapidly. The use of a three-axis device means that it is not sensitive to the way it is held in orientation or elevation. Hall effect devices are also popular.<ref>{{citation|title=A Compass in Every Smartphone|url=https://spectrum.ieee.org/a-compass-in-every-smartphone|journal=IEEE Spectrum |author=Willie D. Jones|date=Feb 2010|access-date=21 October 2012}}</ref>

Researchers at [[Deutsche Telekom]] have used magnetometers embedded in mobile devices to permit touchless [[3D interaction]]. Their interaction framework, called MagiTact, tracks changes to the magnetic field around a cellphone to identify different gestures made by a hand holding or wearing a magnet.<ref>[http://portal.acm.org/citation.cfm?id=1720048 MagiTact]. Portal.acm.org. Retrieved on 23 March 2011.</ref>