Wireless operations permits services, such as long range communications, that are impossible or impractical to implement with the use of wires (Imel & Hart, 2003). Wireless communications is used in the telecommunications industry to refer to telecommunications systems which include radio transmitters and receivers, remote controls, computer networks, etc. These telecommunication systems use some form of energy like radio frequency (RF), infrared light, laser light, acoustic energy, etc. in order to transfer information without the use of wires. In the recent times, wireless communications has become a ubiquitous part of modern life, from global cellular telephone systems to local and even personal-area networks (Schwartz, 2005). The demand for the use of wireless communications has been increasing exponentially ever since it was introduces in the late eighties. Wireless communication has become a ubiquitous part of modern life, from global cellular telephone systems to local and even personal-area networks. Wireless communications has played an important role in the introduction of cellular phones into the global market. Cellular phones can be used and operated only because of wireless communications. ...
There are many techniques to provide the current status of voice and data applications in wireless devices. To let the data applications to get executed, annunciators are provided for these applications and are displayed as appropriate to indicate their current status (Leppanen et al., 2002). Certain data applications may further be associated with additional menu screens and many other applications to allow the user to view additional information. In one method, the current status of a particular application supported by the wireless device is initially determined. This application may be voice call handling, data call handling, voice recognition, voice memo, answering machine, or some other application. An annunciator indicative of the current status of the application is then provided, if required (Leppanen et al., 2002). A menu screen with a listing of all items like missed calls, recorded voice memos, recorded messages or data calls may be displayed when requested, and additional information for a selected item may also be provided if requested. The annunciator is cleared if all items are cleared. Such applications help and assist in developing better understanding and better relations between organizations. Data applications also help in improving the profits the market share of an organization.
Global System for Mobile communications known as GSM in short originated from Groupe Sp'cial Mobile and now is the most popular standard for mobile phones in the world (Cirronet, 2002). It is estimated that eighty two percent of the global mobile market uses this GSM standard. More than two billion people use GSM across the world in over Two hundred and twelve countries. Its ubiquity makes international roaming very common between mobile