Is there a way to block radio and wifi signals on a cell phone?

Hi, Lambert
Your concern is correct. It is important to keep secret. But it's not enough to block the radio and WiFi signals. Now cell phones can sometimes act as tapping device. So to prevent this, Perfectjammer introduced the latest anti-tapping device - wifi signal jammer.
The device effectively blocks radio, wi-fi and cell phone signals. The content of the meeting can be fully protected from disclosure