There was a story a year ago or more out here in Cali about some guy who had cell jammers throughout his car and was driving on areas of the same interstate daily during commute hours and long story short law enforcement saw the pattern and made a stop/arrest and it sounded like he was heading to a world of ****......so just be aware of Those are a whole different set of bands and frequencies for the cell phones, so I can see how that person would be in a world of crap.