Mobile phone. No doubt a smart phone is essential for each of every person in the world. Can any body of present generation  believe that if I say merely 22 years back in India , mobile phone just kept their feet in our country and there were STD booths where mass people do have their opportunity for communication. With a long queue in the booths general public used to be with the system. And computers ? Hardly with the engineers and corporates. Then gradually  internet conception and smart phone requirement arrived in our country. 

I am trying to make you understand easily how a mobile or cell phone works. A mobile phone is basically a radio to receive signals in digital form and as well as radio station to transmit  signals in the form of digital format. In both the cases voice in the form of sound is convereted to electrical signal and vice versa. When you dial a phone number to your friend , it produce a unique electrical output signal meant suitable to establish a unique trace out method to find out your friend's mobile set. This unique identity is set up with each of every SIM card. At the first point, the electromagnetic signal developed by your mobile set is directed towards your nearest designated mobile tower. This mobile tower will then send this signal to satellite from where it will be transmitted to a tower where your friend's mobile set is located. And from that tower your friend's mobile set will be traced out and a ringing bell will sound to alert your friend that someone's call is awaiting in the phone . This is all about the initial stage of calling a handset by other hand set. All the handsets are having multiple Antena to receive and to transmit signals. Similar process are there for your entire conversation  during the entire period that voice in the form of sound is converted to electromagnetic signal in the form of travelling waves in all direction with certain radius and as if solid sphere of electromagnetic wave and then to digital format and vice versa.

Now what about internet? When you browse and try to connect with a wave site, the link itself is a digital to analogy converter and creates an unique identity to send signals to the nearest tower to the website's nearest access station tower via satellite of owned or rented by your Country. From that nearest accessible station point signal datas are transmitted through Optical Fibre Cable to the domain host of the website. These data cables are laid along the sea and ocean to different Countries to make you access to most of the web. With the help of these Fibre  ooptical Cable huge datas are transmitted at the same time. That is why you do not have any questions or waiting or engage blockage in your system while you and thousands of others browse the same web at the same time. Thanks to the Inventor for their innovation of this Data cable.