The technical ability for the student to cheat in the present day is unprecedented.

For exams in most subjects, the cellular phone is held in the lap. The student needs only briefly expose the exam page to the camera of the phone: immediate photograph of the page, ingestion of the page by an artificial intelligence, and then: the student flips the page to view the side exposed to the camera, and glances down to see the answer on the telephone.

Yes, this is really depressing. I don't want to have to ban devices from exams, but it is something I might have to think about.

This can easily be stopped. I don’t see how you would copy whole paragraphs or the working of a physics this way without easily being caught but this can mitigated against.