I thought about it carefully and asked in three aspects. First, the duration of using the mobile phone every day; Second, the time of using the mobile phone every day (class, evening, dinner); Third, what do you do with your mobile phone? Ordering, shopping, maps, entertainment, etc. ); Finally, the results are sorted, classified and tabulated, and the results are obtained. -I think there are some shortcomings. I hope I can help you.