When I taught high school in the 00s, I had to impose rules about what sort of calculators were permitted to avoid cheating, especially as devices which could be used for communication like network-connected palm pilots were available.¹ I also wanted to have the kids avoid buying a $99 TI-89 when a much cheaper calculator was sufficient for the work they were doing.

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1. I remember one cheating technique that my friends in high school AP Chem used where a group of us were sharing a calculator. You would type in the question number you needed an answer for and someone else would type in the letter of the answer (we generally had multiple choice tests).

(Granted, that was in physics where the graders usually use the final answer as a check and rarely deduct many marks if all of the work leading up to an incorrect numerical answer is correct.)