Of course, the prison also has an office phone, but this phone is a bit special. We can only dial in from the outside, but we can't dial out. It's really useless Therefore, the most feared thing for prison guards is that family and friends have something urgent to find prison guards during work. When the prison guard can't be contacted, the prison guard is either in the prison area or on his way to the prison area.
In fact, this problem can be solved by updating the equipment and bringing the mobile phone into the prison area, but the card of the mobile phone can only be dialed in and not dialed out within the coverage of the prison, which at least ensures that the phone will not be missed and will not affect the prison safety management. Mobile phones can be used normally outside the prison coverage area.
Of course, this practice is relatively rare in the whole country, but there are already prisons doing this. It depends on whether the prison is willing to spend money. Because there are some confidential information in the prison computer, we must get the approval of the office before uploading or saving some documents. It is very troublesome and inhuman, and the work efficiency is very low.