Indeed. I know people who said they are encountering school books for 2nd and 3rd graders that seem premised on the idea of such young kids having a cell phone of their own. Even in countries that aren’t high income countries, thanks to Chinese phones. So giving the answer of “no cellphone” may result in more problems from the security crowd that believe “concealment” is a problem even when it involves nothing that is generally considered materially dangerous to the flight.