Understanding css media queries

The Samsung Galaxy S3 is 1280x720 .

On my site I have the following

<style>
            @media all and (min-width: 1024px){
     #desktophide  {display:none;}
}
      @media all and (min-width: 1024px){
      img {float:right;padding-left: 10px;}

}

@media screen and (max-device-width: 480px){
      #mobilehide {display:none;}
      
                    
}
</style>

I don't want to alter my css because it seems to fit most device perfectly. So if I wanted to target the S III (and I'm assuming they have market share so this is important)

The following wouldn't mess up the site that has rendered in a forgiving manner so far:

@media only screen
and (min-device-width : 720px)
and (max-device-width : 1280px) {
#desktophide {dispay:none;}
}