My dear friend , time is so important that if you start wasting it than it gone forever and never come again. You can not get a single second that you waste by your money, valuable thing or your death . and remember that study will make your future not the computer games. playing games on phone will never help you for your job or your exams. Every thing has its limit and use of phone has also its limits . don't waste your time . and remember to give time to your friends because relationships are like plants , if you have not enough time for watering them than they will start dieing.