History of Mobile Cell Phone dates back to 1876 when Alexander Graham Bell invented the telephone and invention of radio by Nikolai Telsa in 1880s. These two inventions laid the foundation of wireless communication that we today know as mobile cell phone.

We understand that the telephone is related to a mobile cell phone, but how is radio related to a cell phone? Well, do you know that a Mobile Cell Phone is basically a radio? Yes, a cell phone is a combination of technologies used in a telephone and a radio. Early telephones were wired and fixed. Use of radio frequency in mobile phones for communication removed the wires and made the telephone wireless. Now there is no need to stick to one place to talk over phone. Now you have the freedom of movement – Just move and talk, hence the name – Mobile Phone.

Today’s mobile cell phones offer all kinds of features including – working with and storing data and information, calculator, internet, TV, games and much more. But did you ever wonder how a mobile cell phone actually works? How are we able to talk to each other over cell phones without the need of any wire?

Ok, here I explain how a mobile cell phone works. First have a look at the pictures below

Let me start with the SIM (Subscriber Identity Module). A Mobile Cell Phone SIM is a microchip with circuitry to access mobile phone network (Technically - Radio Signals). The SIM fits into the mobile and gets connected with a set of circuits build inside the cell phone. A cell phone cannot get connected to any mobile phone network to access radio signals without a SIM. It is the SIM that completes the circuitry inside and once SIM is inserted inside the cell phone, the circuit inside the mobile phone is complete and it starts receiving signals and we are able to talk. One may insert a SIM from any GSM (Global System for Mobile communications) service provider and the phone gets connected to that particular network. CDMA (Code division multiple access) Mobile Cell Phones have built-in SIM.

Mobile Cell Phone Network

Cell Phone Network is made up of a series of base stations to transmit radio signals to mobile phones. The area covered by each of these base stations is called a cell.

A mobile phone gets connected to the nearest base station. If we move from one place to another, the cell phone searches for the nearest base station and gets connected to it. This is why we see mobile towers everywhere.