Ah, well. One of the things I love about my new smartphone is its (relatively) small size. It's small enough that it lives in my trouser pocket and goes everywhere with me. My previous phone was small enough in theory, but in practice I'd put it on my desk at work and leave it on a table when at home.
So my current phone is right on the edge, and I think wrapping any kind of case around it would make it too big. I'd rather have it on me all the time than secure but elsewhere. Also, I've never lost a phone to breakage (I had my previous one for nearly 4 years). If it's in my pocket, anything which breaks it is likely to break me too. If I am venturing into hazardous environments I'll probably move it into a waist pack.
(If anyone's interested, the previous phone is a Sony Ericsson P900 and the current one an SE P1.)
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Quality is addictive.