How to paste a smiley () within Pages or Keynote?
Emoji simply wasn't supported in Pages 4.3 or Keynote 5.3

Our very own fonts guru, Tom Gewecke mentions such in https://discussions.apple.com/thread/4025411?start=0&amp;tstart=0

The 'fix' is to update, I'm afraid.
It works perfectly well in Pages 5.6.1 &amp; Keynote 6.6.1