Next,the part of disadvantages.The first thing is if you can't divide your time,you will be an addicted smartphone guys. It can destroy your time to work or time to learn.Second,It will affect to your eyesight from blue light.Maybe you have to loss your vision if you play your smartphone at night.And the last is your haven't enough time to spend with your family.Because you're always immersed in your smartphone.Anyway we must to use our smartphone not too little or not too much.