There is no signal from the mobile phone during the meeting. This is because the signal jammer is used, which can isolate the surrounding signals and make the mobile phone no signal.
Jammer-MartMarch 2020
It must be said that due to the vulnerability of smart phones, there are several ways to block the signal without relying on special equipment. The simplest is the signal jammer, which will isolate the surrounding signals when opened and make the mobile phone no signal, so that it can not make calls. Or browse the web.
It must be said that due to the vulnerability of smart phones, there are several ways to block the signal without relying on special equipment. The simplest is the signal jammer, which will isolate the surrounding signals when opened and make the mobile phone no signal, so that it can not make calls. Or browse the web.