In many prisons and schools, we are still used to using honest equipment to block the signal.
But 5G is changing these situations, and we need more ways to prevent these things.
For example, we can use the following equipment:

The video shows a newest 5G signal blocking device.
It can block the corresponding signal very well, and is stable and cheap.
This can easily prevent some unnecessary situations from happening. You know that some Internet celebrities are using WIFI signals. For example, using WIFI signal to try to be an internet celebrity while serving a sentence in prison.
https://jammers.store/
This is what has happened. So don't hesitate, replacing equipment is a very good choice.