Originally Posted by QuasiMondo

The problem is that cell phone technologies don't rely on a single transmit and recieve frequency. You'd have to either buy multiple jammers for each frequency or one jammer powerful enough to block out a block of frequencies. The problem with the former is the unintended harmonics that are generated will cause inteference. The latter will knock damn near everything off the air. And something that powerful you don't want to be in the vicinity of.