Can wifi jammers be used to prevent students from cheating on their phones?

In Italy, after sending text messages to college students or taking pictures of students during the exam, they found that teenagers with mobile phone experience were cheated during the exam, and schools began to use wifi jammer to stop this phenomenon.

A local principal said: “There are still many people who don’t follow the rules during the exam.” Unfortunately, we have no choice but to use these small devices. "Their purchase price is about $300, and their low radio frequency can interfere with cell phone signals within a 30-meter radius.