Hi. Can i lock the head movement and do only facial mocap using iPhone / Live Face ? I know i can use a head rig for iPhone. Just asking if there is an in-built function in iClone. 
Thanks

Yes, in the facial capture rollout there is a setting, under Mask, that shows what features you will be recording.  The top left is a button for head rotation (they call it positioning but it's rotation).  Unchecking this box will then not capture any rotational information.

Under the Strength tab you can also adjust the Head rotation down to 0 or whatever amount you want (just another way of doing things).

I do this (unchecking the box) because my body mocap also captures the head movements and I only want facial motion overlayed on it.

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Mike "ex-genius" Kelley