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The head of New Square's beit din (religious court) Rabbi Steinmetz rules you can destroy a person's smartphone at will and not owe the person any compensation:
New Square's beit din rules women may not have or use smartphones, even if they are filtered using an approved 'kosher' filter. It also bans WhatsApp:
New Square Skvere hasidic schools tighten the ban on parents owning smartphones: