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Each of us knows how to use the mobile phone, but does anybody guesses what is inside it and how does it function? The most interesting question is the way the mobile phones search us out in the right place. To explain everything to you the following term need to be used as GSM (Global System for Mobile communications) network. So, everything begins from your phone. There is an IMSI - your International Mobile Subscriber Identity in every phone, encoded on a little card - SIM (Subscriber Identity Module). If your phone starts to work, it means that it starts to search out the nearest station. Then it connects to this station and the most cunning things begin to occur. The key to the whole system is the IMSI. The station is just the connecting link between your phone and the MSC (the Mobile Switching Center). This MSC can be situated anywhere. The MSC consists of two large databases and a joint to the regular phone system. One database serves only your account (HLR - Home Location Registry) and the other is called the VLR (Visitor Location Registry) and is determined for a single station. If you receive a call, this call is directed from the regular phone system through your MSC and to the place you are located now as the system is always aware of where you are. Another interesting thing is to find out how it is possible to call in a car or a plane. The matter is that the stations and MSC cooperate to pass the calls from station to station. But sometimes there can be no connection as there may be dead areas between stations. As for planes you must not use mobile phones during flights because a chance exists that a mobile phone could strike towers. A phone and a tower possess almost equal power signals. In some new planes there is a tiny cell network. It blocks your phone calls and then passes them to the ground. Besides you must turn off all your electronic devices because you should hear all the instructions in case of emergency. One more cunning fact is connected with the battery, and mainly why the battery of the mobile phone occasionally dies faster. As you know the ton signals in the background while you are going with your mobile phone. There are nowadays such powerful phones which apply these signals to adjust to the environment. If you are somewhere not far from the station, your mobile phone uses less power, but the further you go, the more power your phone will use to “connect” with the station. The quantity of mobile phones also influences the battery. When you are, for example, in a very crowded area, then your mobile phone needs more power to struggle the “free place” on the network. Of course, there are much more interesting facts to know about mobile phones. The world of science will always be a mystery full of interesting unknown facts waiting for you to find them out.

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