Depends on what you class as a scratch - my S4 hasn't been in a case and is 2 years old. It lives in my pocket with my keys and the glass front is fine as long as you don't class the tiny micro scratches that you can't see unless you have a microscope as scratches![]()
Only takes one take where you put your phone down on some debris or place in a pocket with sand or something similar and it's scratched, best intentions aside it's easily done.
If you don't sratches yet your either very lucky or you may need glasses.
![Stick Out Tongue :p :p](/styles/default/xenforo/vbSmilies/Normal/tongue.gif)