Imagine you are watching a movie you have been waiting for months to see at a movie theater. All of a sudden, a man's cell phone rings. Not only does the man answer it, but he keeps talking on the phone for a long time. Situations like this make many people need the cell blocking equipment(屏蔽设备). While this is quite understandable, it's much fairer and safer to allow people to use their cell phones in movie theaters.
Using cell phones in movie theaters is a matter of culture. If you look around a theater, most people are not using phones and are enjoying the film they paid to see. The few bad apples are those who are rude in almost all situations, and those who shout at waiters and cut in line. Putting in the equipment would cause trouble for everyone, not just the impolite, but the polite people as well.
There are also some people who disagree to put in the cell phone blocking equipment because of emergency situations(紧急情况). There are times when people might be getting a message that need them to leave the theater at once.
Putting in the cell phone blocking equipment would be unfair to those who know how to use their phones politely. The answer to this problem is to make sure rules are followed, not to stop everyone in the theater from using their cell phones.