I am a 19-year-old student in China.I`m very excited to write this letter. I love iphones because they are so charming. But now I want to say ,the design of iphones is nearly perfect .,but I think there is a small problem about the screen. When we are using the iphones ,it is easy to blot the screen and it will influence the effect. Espectially when we are on the phone ,the screen is easy to getthe grease stain .As for this problem ,I have an idea. I think cancel the in the data line interface. I think the stuff can use the special material which can avoid the dust. I think the lotus leaf may be OK,The following is my simple design.