Why Mobile Phone Use in Aircraft Are Not Allowed?

You are in an aircraft and you want to call one of your family or friends by your mobile but you heard that is not allowed. Do you know why mobile phones are not allowed to be used in aircraft during flight?
One reason for this is channel reuse. Actually, if we go to technicalities, it would be quite hard for us to understand the many technical jumbo mumbo that are there, so let us just put it on the simplest way of explanation that we can. You see, our mobile phones are designed for use with low power output. This is because the transmission and reception of signals are based on channel reuse. What I mean about the word channel are the different frequencies that a mobile phone uses to transmit and receive signals like for example 120 kHz or 100 MHz. These channels of frequencies are expressed in hertz. A particular mobile phone operating at 100 MHz. will have interruption of signal if another mobile phone also operating at the same channel will be using the same cell site or tower.

With regards to cell sites or towers, I think you are more or less particular about them already. They are like very small Eiffel tower like construction that you can see jutting out of the farm landscape, sometimes even inside cities and urban areas. In fact, in our locality, a cell site or tower is now under construction in the backyard of a house, several blocks away from our residence.

Now, going back to why mobile phones are not permitted to be used in aircraft during flight, because of channel reuse. The reason why mobile phones can be used by many without interruptions even when they operate on the same channel is channel reuse. Because mobile phones are designed to have limited power, a mobile phone in operation utilizing the nearest cell site or tower would not be able to utilize another cell site or tower even if that cell tower is only several kilometers away. This will make possible for other mobile phones having the same frequency with the first mobile phone to use the other cell site or tower without interruption to the signal of the first mobile phone, even if it has the same operating frequency as that of the first mobile phone.

It was pointed out by authorities that if you are using a mobile phone in an airplane and the altitude of the plane is within range of the many ground cell sites or towers, the speed by which the plane is moving will dislocate the receiving and transmission of signals on most cell sites or towers resulting to interference of signals to other mobile phone users operating on the same frequency as your mobile phone. In effect, the result will have a negative effect on the fundamental operation of mobile phones which is channel reuse. This is the basic reason of most governmental regulating agencies why they do not allow mobile phones to be used in aircraft during flight.

The second reason would be in terms of electromagnetic interference to electronic devices of the airplane. It was likewise pointed out by authorities that a plane in flight even if it would still be within range of ground cell sites or towers, will make the transmission and reception of signals to and from a mobile phone weak because of the speed of travel. This will make the mobile phone unit to automatically use more power to send and receive signals from cell sites or towers which would have the possibility of affecting the workings of electromagnetic devices of the airplane.
So, for the safety of all, just shut off our mobile phones during flight.