Introduction: The modern age is the era of science. Every day, the vast contribution of science to human well-being can be felt from a variety of experiences. Science has filled people's lives with happiness through their wonderful discoveries. Mobile phones are a new and wonderful addition to human happiness. The field and requirements of its application are increasing at an incredible pace. The impact of mobile phones on communication is so pervasive that modern life, as it is, is unstable.

History of mobile phones: The first scientist, Alexander Graham Bell, was able to communicate messages or words with people far away. Then Marconi took that technology one step further. According to the sources of Alexander and Marconi, a car-mobile was circulated in a police car. The size was similar to a standard suitcase and the weight was more than 5kg. But due to various problems, its practical utility was very low. With the subsequent modification of its order, the utility gradually increases. The present mobile phone has all kinds of facilities including computers, internet, global roaming, multimedia.

Mobile Phone Functionality: A cell is divided into small cells on a mobile phone system. As a result, frequency repurchase is used within the city. And that allows millions of cell phones to speak in the same city at one time. Each cell has a relay station so that both cell phones and relays, including radio equipment from a tower and small building, transmit signals at low power. Each cell can be 5 square miles or less. Every city is controlled by a central office, called a mobile telephone switching office.

Mobile Companies in Bangladesh: Mobile phones have made amazing progress in Bangladesh. About two million people in this country use mobile phones regularly and a small number regularly. There are currently six mobile companies in Bangladesh. These are Grameen, Bangla Link, Ektel, Citycell Warid and Teletalk.

Functionality and Radiation of Bangladeshi Mobile Phones: The mobile phone is called a two-way transmitter which can both receive and provide information. When information is sent to a mobile phone, it takes a nearby station through the web and releases it again to a certain extent. In our country, the frequency is usually used in 1-4 MHz. Grameen, Ektel, Bangla Link are using 5 MHz and CityCell using 1 MHz.

Mobile in the development of communication: Mobile phones are making a wonderful breakthrough in communication. This mobile phone has taken the entire world into captivity. Immediately after listening to the mobile phone with a fist, there is a constant exchange of ideas from one end of the world to the other. Wireless and easy to carry, its popularity is sky-kissed. Its ease of transportation and use throughout the court, business, commerce, and various activities, travel, luxury, restaurants, dining tables, vehicles - even in the hills and mountains - has made the world communication system as easy as a river. The whole world has taken the world into a small set of connections. What could be more surprising? In danger - in distress, in pleasure, in pain, in joy, in sadness, in urgent need, mobiles are now a constant companion of every human being.

The mobile option has not yet been explored for immediate communication. There is no difference in the use of mobile phones from the President to the day laborers. Mobile is not a good thing, you can reach the desired news moment via SMS. Mobiles are playing a role in sending greetings to their loved ones and sending their good news or news, rituals, invitations to festivals. Nowadays, through mobile, it is possible to get various services in addition to the talk, sports, healthcare, sending news. Mobile is easily accessible from any part of the world through the Internet and can be easily connected to anyone sitting in the door. News from any part of the world can be easily accessed and you can easily interact with anyone at home, anytime through Internet browsing

In terms of communication, mobile is like a magic wand. With the touch of a thousand kinds of ideas, it is possible to easily execute various necessary activities. The use of mobile phones for entertaining activities such as music playing, watching movies, etc. is truly wonderful. Mobile cameras, video cameras are used to hold memories. Nowadays it is possible to easily carry electricity, gas bills and other tasks through mobile. Mobile companies are arranging to approve news of the national day and government orders. Law enforcement agencies are arresting terrorists by choosing a mobile talking point and setting the pace of communication. Total talk has made an unprecedented improvement in mobile communications.

Harmful aspects of mobile: While mobile communication is cheap and easy, there are some disadvantages. Mobile phones are used as auxiliary activities for theft, robbery, extortion, terrorism, etc. Destructive activities can be triggered by the easily integrated visual cycle through mobile. After receiving advanced news due to the mobile network, sectarians fled the eyes of law enforcement members. Violence threatens the minds of some through mobile phones. Due to mobile phones, school-college-university students have many disruptions in their education. The radiation of the mobile phone causes harm to the human body. Its radiation increases the likelihood of serious diseases such as brain tumors, starting from hypertension in the human body. In addition, it can affect nerve damage, cataracts of the eye, productive changes in blood, and radiation. The ringtone on the mobile is extremely damaging to the heart. Nowadays, it is as if we rely on the machine to follow us. We have become mechanical with machines. We are running slowly with the equipment and the mechanics. Defiantly speaking - I can no longer go back to nature. The mechanism has given people happiness and happiness, but life has become emotionless. This obsession with life has greatly degraded humanity. Robots have discovered that humans are no longer talking and unhappy. To this day, even robots have been discovered that will provide people with companionship. And he is reluctant to leave the green world, he wants to move to Mars or to a different planet. She's looking for a new planet. What is the only book of discovery!