Rav Dovid Cohen, rosh yeshiva of Chevron Yeshiva, recently spoke at a national conference of heads of institutions (Haredi schools) about the need for them to hide their [kosher] smartphones form their students, as the students don't understand that they need to send emails and be in contact with others...
briefly, you can basically do what you want, as long as you make sure other people don't see...
I have heard similar explanations of how this society works from other rabbonim...
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