2. HISTORY OF MOBILE PHONES HATIB LIAQUAT RAJIV BALA

3. Content History of Mobile Phones Origin First time use First Generation Phones to Current Generation Safety and risks of a cell phone Summary and Conclusion References and Use full Links

5. The concept of Radiophones were introduce early days of 1920s and they were used by the Police in 1940s.

6. Radios were used since 1921.

7. The concept of the cellular phone was developed in 1947 which originated from the mobile car phone.

9. Cell phones were first made available to the public in 1984.

11. In 1950, Radiophones were used in Second World War.

12. In 1957 a young Soviet radio engineer Leonid Kupriyanovich from Moscow created a portable mobile phone, and named LK-1.

14. Martin Cooper made the first cellular phone call to Dr. Joel S. Engel of Bell Labs.

16. First Generation Phone

17. Second generation Phones During the 1990s, the technology on the cell phones was called 2G or second generation. These systems worked on CDMA, TDMS, IS-136 and GSM. 2G cell phones had a faster network which functions on radio signals. The 2G cell phones were smaller, around 100 to 200 grams, these were hand-held and were portable.

18. 2G Cell Phones

19. Third generation cell phones The phones we used nowadays are the third generation phones. 3G was soon launched after 2G. 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). Also these Phones could do email, access the internet, stream live videos, radios and use the Wi-Fi.

20. 3G Cell Phones

21. Safety and Risks When the first cell phones were made in 1984, there were many health risks. Cell phones emit radiation that could be harmful. 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.

22. Summary and Conclusion The Сеll рhоne is а latest invention of the 21st century. It is still а new device in many countries. People do not leave their homes without their Сеll рhоne. It's а convenient way to communicate and have made the communication easier. Cell phones are great invention , it has many advantages and disadvantages.

23. References… http://en.wikipedia.org/wiki/History_of_mobile_phones http://www.tech-faq.com/history-of-cell-phones.html http://www.thehistoryof.net/history-of-cell-phones.html http://www.youtube.com/watch?v=JcnXOhrmDB8

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