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mobile phone


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mobile phone

  2. 2. What is a mobile phone?!!!! <ul><li>Today a mobile phone is a small portable means of communication .Twenty years ago. It was a much more cumbersome device . Mobile phone all people to speak to each other, to text each other, to photograph and video. The technology improves daily . </li></ul>
  3. 3. How has the mobile phone changed the world? <ul><li>Mobile phone is a very important nowadays. The mobile phone has changed the world so much, one of them are good for link up with other people, and it also very convenient. </li></ul>
  4. 4. How does a mobile phone work?!! <ul><li>When you talk into a mobile telephone it converts the sound of your voice to radiofrequency energy (radio waves). The radio waves are transmitted through the air to a nearby base station. The base station then sends the call through the telephone network until it reaches the person you are calling. When you receive a call on your mobile phone the message travels through the telephone network until it reaches a base station near to you. The base station sends out radio waves, which are detected by your telephone and converted back to speech. Depending on the equipment and the operator, the frequency that each operator utilises is 900MHz, 1800MHz or 2100MHz. (copy from ) Diagram of a monitoring base station </li></ul>
  5. 5. When and why was the mobile phone work? <ul><li>Twenty years ago. Mobile phones were very expensive pieces of equipment. In many countries, mobile phone now outnumber land-line telephones. Now, many children have their own mobile phone. </li></ul>
  6. 6. What are the functions of a mobile phone? <ul><li>A mobile phone culture has grown, become texting has developed from SMS ‘s – which are short text massages. Other functions of the mobile phone are SMS, games, watch TV, use the internet, listen music and take photos or video. It just look like a computer. </li></ul>
  7. 7. How does a mobile phone help us? <ul><li>I think mobile phone is the best invented in this world. If we don’t have mobile phone, we are very difficult to look for friends. Now mobile phone is a fashion thing of this world, every one are very card about it. </li></ul>
  8. 8. <ul><li> THE END </li></ul>