Electromagnetism

THE MOBILE PHONE

 

• The mobile phone is a gadget used to call people in other countries.
• In this you can download games,music,apps...
• The radio frequency link establishes a connection to the switching systems of a mobile phone operator which provides access to the public switched telephone network (PSTN).
•  The inventor was Martin Cooper,it was invented in 1917.
• There are two tipes of phones ,telephones or mobile phones/smartphones.
• The mobile phones are also called cellulars.
• The most important trade marks are,Apple,Samsung,Nokia,Bq,,Huawei,Blakberry,Sony...
• The common components found on all phones are:
  
  1. A batery, providing the power source for the phone functions.
  2. An input mechanism to allow the user to interact with the phone. The most common input mechanism is a keypad but touch screens are also found in most smartphones.
  3. A screen which echoes the user's typing, displays text messages, contacts and more.
  4. Basic mobile phone services to allow users to make calls and send text messages.
  5. All GSM phones use a SIM card to allow an account to be swapped among devices. Some CDMA devices also have a similar card called a R-UIM.
  6. Individual GSM, WCDMA, iDEN and some sattelite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number. 
• Also it have consecuences for example,if you spend a long time using it you can have headache,or if you listen to music while you are charging it you can burn yourself.
• I live here this video about how does cell phone works

• And remember that the new tecnologies are good if you give them a good use :).
• Bye bye!!!!