France's back-to-school challenges: Phones, payslips, pupils

First day of school jitters are now behind most of France's 11.6 million pupils, but this "rentrée", or back-to-school period, is being marked by a number of challenges and changes: phone bans, concerns over sexual abuse, teachers' salaries, and 161,000 fewer students due to France's falling birthrate. We take a closer look in Entre Nous.