How to protect your mobile phone screen made of glass? The phone case is the most important protection work, according to the author’s years of “naked” experience, tempered film for the frontal collision effect is better, but for the more common edge collision does not play a protective effect, and edge deformation extrusion is an important cause of screen edge shattering. dazzled, but now with the launch of MagSafe, the cases can be divided into two kinds according to with and without MagSafe.