I have the belief that calculators should be banned in K-12.
If you want the kid to understand, machines can’t do the job.
When I taught I had several rules regarding phones (that all have cameras and calculators in them) and the high end calculators. I would not allow “assistance devices” in a class that did not need one, and when I tested I made certain that the problems could all be solved without the need of a calculator. In many classes, the equation could be used in lieu of the numerical answer and I always gave credit for equal answers. 1/9 is really the same as 14/126.
However in the advanced computer class, we had to teach how to solve problems with these devices, so of course they were allowed,
The biggest problem I had was the personal camera, I had a test that was given to all students in every math class of the same subject and an enterprising student photographed each page of the test and then emailed her solutions to her friends in classes that had not been tested. The school should have solved this by having several equivalent tests made and not using the tests over in a later class. In the end, we had to zero the score of several students who had missed the same problems as the girl who passed out her answers.