Hi all, Following the recent thread I started, to which both Quentin and Aaron contributed very helpfully, I have been doing some more research online and found the following case: Koolertron Bluetooth 3.0 Sliding Qwerty Keyboard Hardshell Case Cover for Samsung Galaxy S4 S IV i9500 I did consider getting this case but I have a couple of questions first: 1. Does hard shell mean that the back will have to come off the phone for this case to work? 2. What does "S IV i9500" mean? Is it a particular model of S4 and if so how do I check if I have such a phone? Alexander Shannon