The reality is that smartphones exist. Wireless communication exists. I can access the Internet from anywhere. When I use cell phone jammer, they almost always try to solve problems that are completely different from what I think they're solving. Smartphones and wireless devices are spreading rapidly. If there are social problems that these realities seem to create, the best solution is to stop the telephone.
Other people's smartphone use is disconcerting and distracting. Illegal use of the Internet seems to be a big problem. We will use radio wave jammers. But the real problem is that most exams are based on traditional learning concepts. Testing makes everyone better and fraud obsolete.