Abstract:
The developments of wireless communication systems like mobile phones make it indispensable in our lives; this
is due to the portability of mobile devices. Mobile phones features can produce inconvenience in the places where the
silence and security are important. As well as, in certain locations the using of phones is refused due to the safety and
security reasons and in exam places where the phone device is used in cheating. Jammers are devices which appeared now
days in the markets. These jammers cut off the link between the cell phone and base stations via transmit a signal in the
same frequency but larger power with no interference within communications other than cellular in the specified zone.
Cell-phone signals usually emanate from a base-station that is usually made up of a very tall building and a small-building
housing the radio-equipment. In this paper, Cell phone jammer device was proposed, designed and finally implemented to
find dead zone to cell phones of Iraq to block the cell phone neither receiving nor transmitting the signals to the base
station. LCD is used with Arduino to show a message if the signal is jammed or not yet. Cell phone jammers are firstly
designed for the military forces to disconnect the communication by criminals and terrorists but recently it used civilian in
the colleges and hospitals and so on. The designed system obtained the good results what we need to jam signals for dual
band GSM 900,1800and 3G within a very short time reach to 30 sec.
