The answer is not so simple. To be fair, almost without realizing it, most of us do it. To find the answer we will have to go into the mechanisms of telephony. The first phones had a very small return, called lateral tone, which turned out to be very useful, because you could hear the volume of your voice. Even today, all landlines and mobiles come with a lateral tone. The problem with mobiles is that we do not use them in a fixed place and then the Lombard Effect appears, discovered in 1909.

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