cell phone blocker.. how to do it?

Cell Phone blocker transmits low power radio signals to cut-off communications between cell mobile phone and cellular base-stations. It does not interfere with any communications other than cellular within the defined regulated zone.Upon activating cell mobile phone blocker, all idle phones will indicate "NO SERVICE". Incoming calls are blocked as if the cellular hand phone is OFF. When cell mobile phone jammer is turned off all cell hand phones will automatically re-establish communications and provide full service. cell mobile phone jammers block cell mobile phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication of cell mobile phones and the towers to render the phones unusable. It is easy to install and operate the device. No adjustment is needed. If not well paralyze happened, please change the installation location or position or to check if any cellular control stations or repeaters installed just in nearby.