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If by "signal" you mean the cell signal, then yes you can install cell phone blocking devices (which raises the question, what do you do in an emergency?).
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I was thinking more along the lines of blocking 'very locally' -- meaning within a classroom (classroom independent), but leaving the campus signal unrestricted. Kind of like having a bubble within each classroom, ideally, one that can be turned on and off with a switch.
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If you mean wifi, then you make the devices useless as they won't be able to communicate with the school servers, etc
You could block certain ports from accessing the Internet (e.g. IM apps), and you could block certain websites (e.g. FaceBook) via a proxy server, but both can be worked around in various ways. .
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I understand the port blocking (understand I am not a 'tech' person), but, with a particular problem I had a few years ago, with a device called 'Alpha Shield' (which I had installed in front of my router), it was not allowing a port that I had opened on the router. The IT at my ISP was quite interested in this. The outcome, with him working at his end, and mine, was to take this device off the line. That was the only option that solved it. So, I am going back to that, and assuming that the blocking process can happen hierarchly (is that a word?)?
Ultimately, some genius may solve this??? Think of the bucks they'll make???