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QR codes storing addresses and [[Uniform Resource Locator]]s (URLs) may appear in magazines, on signs, on buses, on business cards, or on almost any object about which users might need information. Users with a [[camera phone]] equipped with the correct reader [[software#Application software|application]] can scan the image of the QR code to display text, contact information, connect to a [[wireless LAN|wireless network]], or open a web page in the telephone's browser. This act of linking from physical world objects is termed [[hardlink (homonymy)|hardlinking]] or [[object hyperlinking]]. QR Codes may also be linked to a ___location to track where a code has been scanned. Either the application that scans the QR Code retrieves the geo information by using GPS and cell tower triangulation (aGPS) or the URL encoded in the QR Code itself is associated with a ___location. <ref name=GeotaggedQRCodes>{{cite web |url=http://qrd.by |title=Geo Tagged QR Codes |accessdate=27-10-2011}}</ref>
[[File:Z80-Tianjin -Beijing.jpg|right|
QR codes can be used in Google's mobile [[Android (operating system)|Android]] operating system via both their own [[Google Goggles]] application or 3rd party barcode scanners like [[ZXing]] or [[Kaywa]]. The browser supports URI redirection, which allows QR codes to send [[metadata]] to existing applications on the device. Nokia's [[Symbian]] operating system features a barcode scanner which can read QR codes,<ref>{{cite web |url=http://europe.nokia.com/support/product-support/nokia-n80/phone-software/smartphone |title=Nokia Europe{{ndash}} Nokia N80{{ndash}} Support}}</ref> while mbarcode<ref>{{cite web |url=http://maemo.org/packages/view/mbarcode/ |title=package overview for mbarcode |publisher=Maemo.org |accessdate=28 July 2010}}</ref> is a QR code reader for the [[Maemo]] operating system. In the Apple iOS, a QR code reader is not natively included, but more than fifty paid and free apps are available with both scanning capabilities and hard-linking to URI. With [[BlackBerry]] devices, the App World application can natively scan QR codes and load any recognized Web URLs on the device's Web browser. [[Windows Phone 7.5]] is able to scan QR codes through the [[Bing]] search app.
▲[[File:Z80-Tianjin -Beijing.jpg|right|213px|thumbnail|QR code is used and printed on Chinese train tickets since late 2009.]]
In the USA, QR code usage is expanding.{{Citation needed|date=August 2011}} During the month of June 2011, according to one study, 14 million mobile users scanned a QR code or a barcode. Some 58% of those users scanned a QR or bar code from their home, while 39% scanned from retail stores; 53% of the 14 million users were men between the ages of 18 and 34.<ref>August 16, 2011 http://www.internetretailing.net/2011/08/14m-americans-scanned-qr-and-bar-codes-with-their-mobiles-in-june-2011/</ref>
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