Signal jammers are meant to stop the kind of blatant cheating where you take a picture of the problems, send it to a hired test taker on the outside, and receiv

Signal jammers are meant to stop the kind of blatant cheating where you take a picture of the problems, send it to a hired test taker on the outside, and receive the answers. (A Google glass like device would be especially powerful at this.) Not surprisingly if you only use your phone as a digital cheat sheet then an online one isn’t that much better than an offline one.