Actually some of us thinks that yeah I’m having a very good quality of glass in my phone and my phone glass will not get scratch or it will never break. So it is not true, if you are having a good quality of glass in your phone like gorilla glass etc. than also there are chances that your phone’s screen can break if it get a hard fall or whatever. And it is very common for any glass to be get scratched because of sand. now you will think that what sand can scratch my phone’s glass, than yeah because the particles of sand are of higher level and higher hardness than of the glass. So I will say that you must use a screen guard or protector for your phone, so that it might not get scratched.
In future we might get some screen glasses in our phones with much higher level and hardness and they might not get scratched or even they might not break. In present there are very very less glasses of this kind in very less mobile phones, but still why take chance?