I must emphasize that the use of radio blockers is restricted by law and unauthorized use may be illegal. In most countries, radio jammers can only be used legally by certain agencies and authorized personnel (such as the military, law enforcement agencies, or licensed radio operators). Illegal use of radio jammers may interfere with the normal communications of others, causing serious consequences, and you may face legal liability.
However, radio jammers may be used legally in the following locations:
Military applications: Military forces may use radio jammers to interfere with enemy communications systems to impair their communications capabilities and intelligence collection.
Law Enforcement Operations: Law enforcement agencies (e.g., police, security agencies) may use radio jammers to prevent or interfere with criminals or terrorists' use of radio equipment to communicate in order to curb criminal activity.
Security protection: In some security-sensitive places, such as government agencies, military bases, prisons, etc., radio jammers may be used to block unauthorized radio communications to prevent information leakage or unauthorized activities.
Please remember that in any case, the legal use of signal jammers needs to comply with relevant laws and regulations and be subject to the guidance and supervision of authorized agencies.