My new I phone i bought in May, resides in a lime green I Blason protective hard shell, and when i venture out in questionable weather, it sits inside its Aquapac case.
I Blason make a similar case for all the popular smart phones.
The I Blason case is one of the highest quality armour casing made for the I phone range, and even though its not waterproof, its showerproof, and gives maximum protection on all surfaces.
The Otterbox is its closest competitor, but the protective touch sensitive screen protector, is a specially developed resin, that is impressively thick, and gives maximum protection to that expensive screen on your phone.
No phone case is fully waterproof, so an Auapac comes in handy, but the I Blason case is the one to get if you want to protect your phone.