Do you mean just students in high schools, or across the board? Obviously, in college, you can't set aside time for students to use their phones because they set their own schedules. As an instructor in a computer classroom, I know that if I tried to stop anyone from ever texting or checking Twitter, I would never have time to do much else. But I have heard of instructors who ask students to put all their possessions -backpacks, purses, etc- against the wall when they come in. I don't know how effective that is for them. What might you say to people who argued that students are capable of multi-tasking? Or to students themselves, who presumably don't want to leave their phones or laptops behind?