In addition to coverage area and battery limitations, someone is going to have to pay 30 a month for a data plan for each and every student. They will need jobs, or a public subsidy. Then, they all need smartphones. They will need jobs or some other way of paying for them. Not to mention, the smartphones will need to be replaced every 2 years, just to keep up with technology. Of course, they can be broken, lost or stolen. Maybe we will need a universal phone insurance mandate.
On the upside, we will be able to know where each and every one of them is at any given time.