Not sure I understand the question. Students use Calculators more as they get more advanced in math & science. They need calculators vs. their computers or phones because in class & tests because it's harder to cheat on tests using "approved" calculators.
In my son's Algebra II class the teacher tells them when they are allowed to use calculators. My son has a scientific he has used for years, and graphing calculator we bought this year. Some of his tests have two parts one where the calculator is allowed, and another where it isn't. My son will be taking Chemistry next year and using a calculator is expected. Otherwise the homework would take forever, and since it's the science teachers don't care to be grading the kids wrong on arithmetic errors.
