GSM & GPRS phone
Wireless communication systems have an ever-increasing use in transferring voice and data services. Such communication systems include the Global System for Mobile (GSM) communication. The global system for mobile communications (GSM) is a digital cellular communications standard which was initially developed in Europe and has gained rapid acceptance and market share worldwide. GSM mobile radio systems allow communications connections to be set up to mobile subscribers by transmitting information by means of electromagnetic waves via a radio interface between a transmitting and a receiving radio station. In GSM mobile radio systems, electromagnetic waves are emitted with carrier frequencies in the 900 MHz, 1800 MHz and 1900 MHz ranges. GSM offers a useful range of network services and standards. GSM standards define protocol stacks that are used in conveying signaling and user traffic between elements of the network, including subscriber units (also known as mobile stations--MSs), base station subsystems (BSSs) and mobile switching centers (MSCs). The general packet radio service (GPRS) is a new non-voice value added service that allows information to be sent and received across a mobile telephone network. General packet radio service (GPRS) provides data connection service for Global System for Mobile Communications (GSM) telecommunications networks. GPRS also facilitates instant connections in which information can be sent or received immediately as the need arises, subject to radio coverage. No dial up modem connection is necessary. The main benefits of GPRS are that it reserves radio resources only when there is data to send and it reduces reliance on traditional circuit-switched network elements.
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