Mobile phone jammers were originally developed for law enforcement and the military to jam criminal and terrorist communications. bombs dropped in Spain in March 2004, as well as those detonated in Bali in October 2002 and Jakarta in August 2003, were detonated by mobile phones. A mobile phone jammer reportedly prevented an assassination attempt on Pakistani President Pervez Musharraf in December 2003.

When President Bush visited London in November 2004, British police reportedly condemned London to tears to protect the presidential briefing.
In the event of a hostage situation, the police can control when and where the captain makes a phone call. Police can block calls during a drug attack to prevent suspects from communicating.

Later mobile phone blockers were widely used in temples, churches and other religious places. In some cinemas, churches, courthouses or meeting rooms where camera equipment can be used, you may find that your mobile phone has no signal. Then, if a person forgets to turn off their mobile phone and it does not ring, the mobile phone jammer can work properly and the meeting can remain quiet. Mobile phone blockers can also be used in areas where radio transmission is dangerous (with potentially explosive gases)

WiFi jammers are also used to stop surveillance of the community by blocking voice and photo transmissions from cameras and mobile phones.