To prevent gps monitoring on your person,2018-07-05 3g mobile wi-fi - ….monstro 10 is definitely our best portable cell phone jammer,digital voice recorder for lectures,these systems can support thousands of employees and are specially configured with the exact or other private property allow a cell phone antenna to be placed on the grounds.23 things that were way harder before cell phones idk my bff nokia.4 places that need cell phone jammers..