CellPhoneJamming
oh yeah I will jam you too....
now cellphone jamming can be bought for $169. The Jammer looks like an old ericson handy with two antennas and can jam any cellphone signal in an area around 15m. I guess it will be not too hard to extend this range with some proper gear(antenna amplifier) and more power toward 100 meters (just a thought driving in front of a bussiness building and blocking the whole building from cellphone reception) anyway this is from the "cool spyware available to you" department which I now open as a new category :)