Reading book is better

I think books are better for studying because if we have a class rule to do not phones in class, then we probably won't do something else with the book. Like don't pay attention or watch youtube. However if we study with phones instead of books, things might change, because even though sometimes mobile application are very useful for our knowledge, and it is very convinient, we can watch youtube or play games with phone. Which makes phone a good thing to use to do not pay attention during class.

I think books are better for studying because if we have a class rule to use smartphones while having the lesson, then we probably won't do something else with the book. Like don't pay attention or watch youtube. However, if we study with phones instead of books, things might changed, because even though sometimes mobile application are very useful for our knowledge, and it is very convinient, we can watch youtube or play games with phone. Which makes phone a good thing to use to do not pay attention during class.