For elementary school children, popular media includes the smartphone, and it is not harmless.
Rod Dreher quotes a reader of his blog:
Our daughter was asked by a boy to provide oral sex for him at recess…in first grade. Boy was from a nice church-going Christian family but he had a smart phone and he and other boys were spending their time on porn sites all during school at recess and at lunch. Parents were nice people but clueless about what their kid could access via the phone and the teachers are too busy with academics to be paying attention.