Cell phone jammer are cheaply and readily available. While you can make a super powerful and expensive one that wipes out one city block worth of coverage, the majority of these jammers have a hard time penetrating walls. If you live close enough to a prison that these little cell phone jammer...
An actual cell phone jammer in a key that somehow gets power through the key hole would be a good investment for rental car companies or those with fleets. Then again its possible to wire an actual cell phone jammer to the accessory/ignition switch. Perhaps the cell phone jammer should only work...
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