A cell phone is a great gadget in this modern world. What is a cell phone? A cellphone is actually a radio in certain way. Like a radio, by a cell phone we can communicate
to other people in real time. Million people use cell phone for their communication. Even
nowadays, people use cell phones to communicate in voice, written and data. Alexander
Graham Bell is the person who make great change in the way people communicate to each
other. He invented a telephone in 1876. While wireless radio was formally known in
18994 presented by Guglielmo Marconi. By these two technologies, then a cell phone was
born. However do you know how actually cell phones work?
This short explanation on how a cell phone work is really wonderful. A cell phone or
in long term "cellular telephone' works by transmitting signals of radio to towers of
cellular. The towers are networked to a central switching station. The connection usually
uses wire, fiber optic-cables, or microwave.
Then the central switching station which handles calls in certain given area is directed
connected to the wire-based telephone system. Cellular are pick up by the towers and
relayed to another cellular telephone user or the user of wire-based telephone network
The towers vary in the capacity and capability to receive signals. Some can receive the
signal from short distance and the others can receive more distance. However, there are
usually more than one tower in certain given area so that the system can handle the
increasing telephone traffic

1. what do you know about cell phone?
2. how does cell phone work ?
3. what is the main idea of the last paragraf ?
4. what is the relationship between the invention of alexander graham bell and guglielmo marconi ?
5. what is your opinion about the overuse of cell phone off the students?​