The mobile phone jammer is a device that gives off signals in a frequency which is in a similar range that mobiles use, successfully obstructing the communication by creating powerful interference. When the cell phone comes within the jammers range, it loses its signal. The cell phone will simply show “no service” or “no reception strength”. Unluckily, buses, subways, trains, café, shopping malls and even grocery market suffer due to the spread of mobile phones. A person’s noisily converse about their professional, mundane and private business in the public arenas forces everybody nearby to hear.