According to some estimates, about 82 per cent of the global mobile phones are adhering to the Global System of Mobile communication (GSM). This system, which is promoted by the GSM Association, is available almost all over the world. GSM facilitates the users of mobile phones to change the carriers without changing the phones. Mobile users are also able to change the network operators provided such operators opt for equipments from vendors who implement GSM. The flexibility inherent in the system makes roaming possible between operators and in turn allows the consumers to use their mobile phones in all parts of the world. Another feature of the GSM is that it has offered the facility of short messaging service. Now SMS is a feature incorporated in all other mobile standards.

The global system of mobile communication is a cellular network, which has offered innovative features to the mobile phones. Fax and e mail are among those features which make the mobile phone a perfect portable device of universal appeal. A mobile phone with GSM will be able to make ISDN connections like internet, through the conventional information service providers. The mobile phones are provided with GSM modems as software packages compatible to MS windows. It is now used in about 200 countries in the world and is the most popular standard in the mobile telephony. It has distinctively different characteristics than its predecessors. Here, signaling as well as speech channels are digital; therefore it is considered as the generation two or 2G mobile phones.

The introduction of the GSM has heralded the progressive changes in the mobile phone system, which later gave way for third generation system (3G). In fact the most advanced features available in the smart phone were possible because of the adaption of GSM as a first step towards its perfection. The detachable subscriber identity module (SIM) card is a feature that enabled the user to retain the information contained therein, even if the operator or the handset is changed.

While shopping for the product, the consumers should make sure that the frequency of the GSM phone is compatible with that of the service provider. It is designed with reasonable degree of security. All communications between the subscriber and the base station can be encrypted. As in the case of all other consumer durables, online shopping is an ideal option to buy GSM mobile phones. But the consumer should be cautious in choosing a dealer. The sophisticated device of GSM mobile phone with advanced technological features are manufactured and marketed by all well known companies in the global market. However, both expensive as well as cheaper versions are available for the shoppers to choose from.

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