The range of a cellphone signal jammer's effectiveness depends largely on the type of jammer being used. Personal jammers have a much more limited range than military and police jammers. Signal blockers don't actually prevent cellphones from transmitting signals. Instead, they create interference that blocks the signals being transmitted. This interference is effective because it is broadcast on the same frequency ranges that most mobile phones use.
Cellphone signal blockers have a variety of potential uses, particularly in a military setting. Jammers can be used to prevent or significantly disrupt cellphone communication between criminals and opposing military forces. This is particularly useful in situations such as hostage crises and bomb threats because it prevents the perpetrators from organizing behind the backs of the police. In a military situation, jammers can be used to prevent communication between separate branches of an opposing force.
Personal signal jammers have a much lower range than military models, but they have just as many potential uses. Personal jammers have a range of anywhere between 60 and 80 feet away from the device itself. They can be used to prevent people around you from using cellphones in places such as movie theaters or business offices, or anywhere else where you wish to be undisturbed.
Though they are still used by police and military units when the situation warrants it, cellphone signal blockers are illegal in the U.S. It is against the law to purchase, possess or use a cellphone blocker in a private setting. The only way such devices can be obtained is through illegal importation or theft, both of which carry criminal charges of their own in addition to the charges attached to the jammer itself.
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