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Globalization has made this world a small place. People travel all over the world for personal and professional reasons. Staying connected to family, friends and business acquaintances is a requisite for the travelers. With the advancement of technology, the mobile manufacturers have come up with new mobiles to make our lives simpler.
Global System for Mobile Communication (GSM) and Code Division Multiple Access (CDMA) are the two dominant technologies in mobile telephony. Currently, GSM has wider coverage and acceptance in the world. More that 150 countries in the world use Global System for Mobile Communication (GSM) technology for mobile communication. There are four frequency bands that are used in different countries for the mobile operation. The mobile phone should operate according to the frequency used in that particular country for mobile communication. Locked phones are those that recognize SIM cards from a particular frequency that is being used. Hence it cannot be used globally. Unlocked GSM cell phones are a new revolution in the telecom world. These cell phones can recognize any carrier frequency. There is no difference in the hardware between locked and unlocked phones. In locked phones there is a software program that puts a lock on the frequency that is used being used by the operators in the region, whereas in the unlocked cell phones, a code provided by the carrier is used to unlock the cell phones. This enables the user to lock onto any frequency.
Unlocked cell phones are significant for the people who often travel abroad. Locked cell phone will not lock to the frequency that is being used in the country you are visiting whereas unlocked cell phones can switch over to the carrier frequency of the local operator of the country you are visiting and you can use the same cell phone.
In the market, wide range of unlocked GSM cell phones and SIM cards are available such as Motorola, Panasonic, and Samsung. Considering the several advantages of the unlocked GSM phones, different vendors are coming up with their range of phones that can provide flexibility, convenience and cost effectiveness to the user.
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