Are students addicted to their cellphones?

I feel that students can be addicted to their cellphones because, on their phones, they're always on social media. Some students always spend time in their room or at school on their phones, instead of walking around or play with the fresh air and talking with friends. They're always on Instagram, Facebook or Snapchat e.t.c. They'd get addicted to posting photos/videos and check who likes it or comments on it, and when they do, they'd probably go around on other people's post and like it or comment on it and that would probably take them for ages. The one thing that worries them is cyberbullying. This can cause a huge problem because, other than worrying about their studies, they worry about social media. It can also damage a students brain or cause pain on the body and on the eyes. This is why I feel that students can be addicted to their phones because, of social media.