Can mobile jammers really block all mobile phone frequency bands?

We are tired of being interrupted, especially in important places. I am tired of cell phone ringing. The leader presided over an important meeting and was annoyed by the ringing of the mobile phone. For meetings, use cell phone jammer in the meeting room to maintain a good environment. Mobile phone ringtones make people more tired, especially in some quiet public places. In many places, the widespread use of mobile phones has banned the use of mobile phones, because they are using mobile phones, which will affect the rest and work of others, and will affect others. Even for such gas stations, there is a clear prohibition to indicate the deceleration effect of mobile phones, but the deceleration effect of mobile phones will affect the places where such devices are used. However, many people use mobile phones in these places where people use mobile phones. It is very dangerous, and it is very likely to explode. We need to keep the content of the meeting confidential. You need to know that important national meetings will last for several days, and mobile phones are banned, so you can't interrupt them outside. This is not just a national conference, it has been adopted by many corporate conferences, such as the ban on mobile phones and the gradual installation of mobile jammers.