Cellphones in disguise
There is nothing we can’t do with our phones. They even have a calculator app that makes actual calculators obsolete. So maybe it is time we find a new use for calculators. We should get creative and find a way in which these devices might help us.

If you are asking yourself how you can use them for cheating, just take a look at the picture above. You will see that you can open one and perfectly fit a phone inside. You have a concealed answering machine on top of your desk, and your teacher won’t even notice.