New mobile phone microphone call blocks the microphone in all mobile phones within its range. By jamming the microphone in the mobile phone it prevents the users from making or receiving intelligible calls.
The mobile phone microphone jammer does not interfere with the cellular network and is perfectly legal to use as it uses audio sound acoustics for its operation. No human audible sound can be heard from the device making it totally covert in use.
The mobile phone call jammer is directional and portable and can be used both indoors outside.