This item is very good. I'm using it from near two weeks and there is no any problem with it. My phone is 5" Neken N6 and this case fitx perfect to it. So, I don't believe that it will fix to 5.3" phone. It's not so big, but you will not be able to connect the handsfree plug to the phone when it is putted in the case. It's quite hard for me with my 5" phone to do that.