Loudspeaker - definition
Basically more or less in every mobile device there are two main blocks of speaker. One is situated on the front top side, this one is mostly used for communication or calling services. And another one is situated at the rear bottom/top/mid side. It is mostly used to play the sound in a larger speaker so that the sound becomes much louder. Loudspeaker is a term which appears during the call, if the user needs to listen to the other person in louder sound, then user may turn on the loudspeaker facility to throw the sound from earpiece to loudspeaker.