While I have heard of its use, it seems making a convincing 'carrier' may be more difficult than it seems with the limited bandwidth, and monitoring. But I may be wrong. In relation to the law it seems to violate the 'open public use' provision, but I am ignorant of the fine print. I do know the fcc is unreasonably good at finding and prosecuting illegal transmissions, but will stop short of incriminating myself or others.