How to prevent employees from using mobile phones during work hours?

I opened a factory and found that many employees secretly play mobile phones during working hours, which greatly affects work efficiency and production safety. How can I stop it?

Topsignaljammer  2022.

You can install a signal jammer; conference room-type mobile phone signal jammers are generally omnidirectional, and are generally used during meetings in companies to prevent employees from playing mobile phones during meetings, and being unable to listen to leaders’ speeches from damaging the meeting atmosphere. The mobile phone signal jammer is installed on the top wall of the conference room, which can fully cover every dead corner of the conference room.

Factory-type cell phone jammer are directional, and the installation position is generally installed on the top of the factory workshop and outdoors to prevent employees from playing mobile phones at work. After installation, the production efficiency is greatly improved.