Mobile games are played using the technology present on the device itself. Mobile games are usually downloaded via the mobile operator's network, but in some cases are also loaded in the mobile handsets when purchased, via infrared connection, Bluetooth, or memory card.
Games played on a mobile device using localization technology like GPS are called location-based games. These are not only played on mobile hardware but also integrate the player's position into the game concept. In other words: while it does not matter for a normal mobile game where exactly you are (play them anywhere at any time), the player's coordinate and movement are main elements in allocation. The best-known example is the treasure hunt game Geocaching, which can be played on any mobile device with integrated or external GPS receiver. External GPS receivers are usually connected via Bluetooth. More and more mobile phones with integrated GPS are expected to come.
Besides Geocaching, there exist several other location-based games which are rather in the stage of research prototypes than a commercial success.
The researcher wants to study this topic to know how much is the business gains of mobile games in this kind of business. Another thing is he wants to know the difference between the games in simple mobile phone compare to iPhone, iPod, and iPad.