What are the different types of GSM phones?

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Global mobile communication system (GSM) is the most popular mobile communication system in the world that boasts three billion subscribers since 2010. The second generation system allows users to use the phone as usual almost anywhere in the world. GSM phones are working on a subscriber identity tab (SIM) that says the network that the phone is and which allows the user to store data such as telephone numbers, calendars and notes, which can then be transferred to other GSM phones immediately. There are many different types of GSM phones that offer a number of different features; In addition, there are multi -band and multi -band phones. GSM base headphones come up with features such as voices encryption, text message, caller ID and calling, but newer models may include short messages (SMS), Multi-Call conference and promoting global satellite location (GPS). Even with a lengthy list of bonus functions, the basic categories of GSM phones remain the same and refer toThe way the phone works on the network.

The first thing to consider when buying a phone is the frequency at which it operates. Mobile phones on 850 or 1900 Megahertz operate on the western hemisphere, while the Eastern hemisphere uses 900 or 1800. The mobile phone will already be equipped with the frequencies used in the country where it is purchased, but some phones offer the ability to run at a different frequency unless the original frequency is supported. These devices, which are referred to as "multi -band" phones, have become very popular with passengers because they are functional in most places around the world. Multi -band phones come in dual varieties, a three -fiction; Thepoded more frequencies, the better roaming skills.

In some cases, coverage is not limited by international borders, but a geographical area. While GSM is widely supported, some cloudsSTIs can only be covered with access to code resolution (CDMA) or even analog transmission. In this case, GSM phones will not work. Some telephone companies are now offering phones with multiple modes that can switch to another type of transmission if the original type is not available. There are dual and triple phones, but the meaning of these conditions can be unclear.

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GSM double -mode handset will support GSM and CDMA transmission, and the real triple -three phone will support GSM, CDMA and analog transmission. Some companies indicate phones as TRI-ERIME if they support two different GSM and analog frequencies, which is not entirely accurate. This type of phone is really a two -mounted double -mode phone. The word "band" concerns a frequency that differs by Earth. The word "mode" of the transmission type, which varies according to the geographical area.