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I use the Incipio Feather on my 4S and it's good. Very thin, holds the iPhone in nice and tight, and has a slight raised lip meaning the iPhone can see screen down on a surface without the screen actually touching it. The only slight downer with clear plastic is that it gets scratched very easily, even under normal usage of placing it on a table, in/out of pockets etc.

But, at least your phone is protected :)
 
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