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It has the same spring-loaded mount as the QX-10, which will allow it to clamp onto any smartphone including the iPhone 5S. I know it's not a case, which would be optimal, but until one is created, the QX-100 can still be used.


Hell, Sony even uses an iPhone in their demonstration here:


http://www.youtube.com/watch?v=hcWLiR9qNqw
 
As far as I know

As far as I know SONY only plans to release custom cases for their Xperia phones, not any others.
That being said there may be some 3rd party ones released.

Its all good though because the universal clip is rather sturdy on both of them (ive had one for about 3 months now, no slipping at all)

Check out this review comparing it and using it with the iPhone 4s, maybe it will help you decide whether this camera is right for you.

https://www.youtube.com/watch?v=50I12J2p5OI
 
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