Have a device that can jam cell phone signals?
Sometimes we have to put up with loud phone calls in public places like cinemas. Most people want to block their cell phone signal when they watch a movie. But the phone still bell rings. That time, we will think, if can let the bell stopped...
Fortunately, we can buy a device called cell phone signal jammer on the Internet at present. In this case, you can turn on your cell phone jamming device