As protection Okay, but ...

... To call unfortunately rather unsuitable. The iPhone is too tight in the case. When an incoming call, it takes skill and liberate dry and not slippery fingertips to the phone from his "straightjacket" especially. Thus, already nothing for frequent callers. I have the envelope given a couple of weeks, so I thought that it widens and is a little looser. But this is not so.
Even the iPhone4 looks at me a little, so that the shutter does not close properly out (I have not measured it).

Conclusion: To protect very well - but only if you do not want to use to call the iPhone.