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A mobile phone (also called mobile, cellular telephone, or cell phone) is an electronic device used to make mobile telephone calls across a wide geographic area. Mobile phones are different from cordless telephones, which only offer telephone service within a limited range of a fixed land line, for example within a home or an office

In addition to being a telephone, modern mobile phones also support many additional services, and accessories, such as SMS (or text) messages, e-mail, Internet access, gaming, Bluetooth and infrared short range wireless communication, camera, MMS messaging, MP3 player, radio and GPS. Low-end mobile phones are often referred to as feature phones, whereas high-end mobile phones that offer more advanced computing ability are referred to as smartphones.

The story-based, participatory AR games developed by the ROAR team are played on Apple iPhones and Android-based smartphones and use GPS technology to correlate the students’ real world location to their virtual location in the game’s digital world. As the students walk and run around their school grounds, a map on their handheld displays virtual objects and characters (fig. 1 and 2) who exist in an AR layer superimposed on real space. When students come within approximately 30 feet of these digital artifacts, the AR and GPS software trigger video, audio, and text files, which provide academic and problem solving challenges as well as narrative, navigation, and collaboration cues. Figure 1: Live-view of digital objects on school grounds Figure 2: Map-view of player’s position and digital objects on school grounds

he 2010 Horizon Report includes examples of augmented reality like the Wii under the category Gesture Based Computing. Gesture recognition enables humans to interact with mechanical devices using simple natural gestures. In the future, the use of a keyboard, a mouse or even a touch pad may become a thing of the past with innovations in gesture based computing. See a video slide show of The New Media Consortium/ Educause report Click Gesture-Based Computing : 2010 NMC Horizon Report iPhone geotags. Geotagging and Geolocation Another important part of augmented reality applications is the use of geotagging and geolocation. A Geotag is a GPS coordinate that associates content such as videos, textual information, audio or any user- generated content to a specific location. When photographers use digital cameras, they have the choice to date stamp the video or photo. A Geotag is similar to that type of tag. AR applications draw on specific tags created by companies but will also depend on content that everyday users add through Geotagging. When we go to Google Earth to view a location, we are now able to find pictures and information added by users through these types of tags. Marker vs Markerless Augmented Reality AR Marker QR Code. AR Marker QR Semacode. Currently, many people associate augmented reality with black and white squares that trigger augmented reality elements. These black and white squares are called markers. Markers are also called QR (Quick Response) codes or Semacodes. A QR code is a two dimentional bar code that allows its content to be decoded at high speed. Markerless technology requires no marker to know the position of the object or person. Smartphone browsers that layer information over live locations are often considered in the markerless category, although they still use embedded "marked" information through geolocation and geotagging. The goal is to have augmented reality work much like this HP commercial Jerry Seinfeld for HP

Augmented reality, a capability that has been around for decades, is shifting from what was once seen as a gimmick to a bonafide game-changer.

Various forms of augmented reality, starting with early head-mounted displays, have been around for more than 30 years. Over that time, increased bandwidth and smart phone adoption, as well as a proliferation of AR browser applications, have helped AR evolve from a family of cool gadgets on the periphery of graphics and visualization technologies to an increasingly central player in the technology landscape.

Augmented reality (AR) refers to the addition of a computer-assisted contextual layer of information over the real world, creating a reality that is enhanced or augmented.