HISTORY OF MOBILE PHONES<br />HATIB LIAQUAT<br /> RAJIV BALA<br />
Content <br />History of Mobile Phones<br />Origin<br />First time use<br />First Generation Phones to Current Generation <br />Safety and risks of a cell phone<br />Summary and Conclusion<br />References and Use full Links<br />
ORIGIN<br /><ul><li>The History of mobile phones begins with develop mobile telephony concepts using two-way radios
The concept of Radiophones were introduce early days of 1920s and they were used by the Police in 1940s.
The concept of the cellular phone was developed in 1947 which originated from the mobile car phone.
The First actual cell phone was made in 1973 by Martin Cooper of Motorola.</li></li></ul><li>FIRST TIME USE<br /><ul><li>Radio telephony was first used on the first-class passenger trains between Berlin and Hamburg, Europe in 1926.
Cell phones were first made available to the public in 1984.
At the same year, radio telephony was introduced on airplanes for air traffic security.</li></li></ul><li>WALKIE TALKIE<br /><ul><li>In 1940 The first radio receiver/transmitter, introduce called Walkie Talkie.</li></li></ul><li>FIRST HEXAGONAL CELL<br /><ul><li>In December 1947, Douglas H. Ring and W. Rae Young, proposed an architecture of mobile phone usage in vehicles.
In 1950, Radiophones were used in Second World War.
In 1957 a young Soviet radio engineer Leonid Kupriyanovich from Moscow created a portable mobile phone, and named LK-1.
The first fully automated mobile phone system for vehicles was launched in Sweden in 1960</li></li></ul><li>FIRST GENERATION<br /><ul><li>On April 3, 1973, Martin Cooper, a Motorola researcher made the first analogue mobile phone call using a prototype model.
Martin Cooper made the first cellular phone call to Dr. Joel S. Engel of Bell Labs.
In 1974 SRA releases a mobile telephone whose weight was 3 kilograms, Its dimensions were 13 x 1.75 x 3.5 inches.</li></li></ul><li>Continue of First Generation…<br />Cell phones became popular and received demand from the public during the 1983 to 1989 period.<br />A lot of First Generation phones were not designed to be hand-held.<br />These phones powered by the car battery with a DC outlet.<br />
Second generation Phones<br />During the 1990s, the technology on the cell phones was called 2G or second generation.<br />These systems worked on CDMA, TDMS, IS-136 and GSM.<br />2G cell phones had a faster network which functions on radio signals.<br />The 2G cell phones were smaller, around 100 to 200 grams, these were hand-held and were portable.<br />
Third generation cell phones<br />The phones we used nowadays are the third generation phones.<br />3G was soon launched after 2G.<br />3G cell phones have set standards which the network providers need to follow, these cell phones could also message other users via SMS (Short Messaging service).<br />Also these Phones could do email, access the internet, stream live videos, radios and use the Wi-Fi.<br />
Safety and Risks<br />When the first cell phones were made in 1984, there were many health risks. Cell phones emit radiation that could be harmful.<br />It is possible that cell phones can cause serious health issues such as cancer, sleep disorders, changes in brain activity, and reaction time but nothing has been definitely proven.<br />
Summary and Conclusion<br />The Сеll рhоne is а latest invention of the 21st century. It is still а new device in many countries.<br />People do not leave their homes without their Сеll рhоne. <br />It's а convenient way to communicate and have made the communication easier.<br />Cell phones are great invention , it has many advantages and disadvantages.<br />