GSM is the most popular standard for mobile phone service in the world. In more then 200 areas in the world peoples using GSM mobile service. However, different areas use different Global System for Mobile communications Radio frequency for their mobile networks . Worldwide four frequencies are widely used for GSM mobile services. They are 850MHz, 900 MHz, 1800MHz and 1900MHz.
Although 850, 900 and 1800, 1900 frequency are very close , normally mobile phones ca n’t get more then one frequence at-a-time, a phone that works with one band, can not get signalings of other bands. So if you want your mobile to work with multiple bands, you need to have multi isthmus mobiles. Based on your need, you can go for two fold , tri or quad band mobile set.
As a whole, both high and low frequency bands have some vantage and disadvantages. For high frequency service, the network is less effected by the influences of the conditions . And you can have more clear and un-interrupted connexion. Another vantage of a high frequency is that you only need little antennas . Main disadvantage of higher frequency band is its lower compass . These bands are good for metropolises where density of mobile users is more. Where as, lower frequency bands are good for rural areas because of their big area range . xEOL .850 MHz is the lowest frequency used for GSM mobile service. As a result of this, 850 MHz meshing has a bigger and more perforating ambit then the 900, 1800 and 1900 Megacycle per second network . Apart from that, the divergence between the 850 Mc and the 900 Megacycle per second electronic network hardly noticeable. Lower frequency services are good in large edifice because of their more perforating orbit . A disadvantage of a low frequency mesh is its low capacity. xEOL .900 Megahertz nets are quite old electronic networks. Like 850 MHz, 900MHz also has a bigger and more penetrating scope then the 1800 and 1900 Megacycle per second electronic network. xEOL .1800 MHz is a relatively high frequency for cellular phones. Because of this, 1800 Megacycle per second meshes have a smaller and less imbuing range compare to 900 and 850 MHz electronic networks. By this the Global System for Mobile communications range in heavy edifices is low. An advantage of 1800 Megacycle per second meshings is that the capacity is bigger. This band is idle for cities where density of mobile users high . xEOL .1900 Megacycle per second available only in North America, some nets in Canada and South Africa. This band is not available in Europe or Asia. 1900 MHz quite similar to 1800MHz. Because of high frequency 1900 Megacycle band electronic network is n’t disrupted by the influences of the conditions and you can have a crystal clear connectedness most of the times. For this net , GSM supplier needs to use more mini antennas . An advantage of 1900 Megahertz networks is that the capacity is bigger.

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