Oftentimes, I hear people ask me this question when they see my product:

"Aren't cell phone blockers illegal?"

"No (sir/ma'am), that is a cell phone jammer. A cell phone jammer sends out signals to interfere with other people's devices - potentially blocking 911 calls in an area, etc, and are illegal under federal law, according to the FCC. A cell phone BLOCKER is a bag, like mine, that enables you to block your OWN phone - it is a hardware version of airplane mode that can't be beaten by clever hacks and is designed to prevent cell phone tracking and hacking."

"Oh."