Using iphone 4 in presentation with LCD projector

The mirror function has disappeared from my iphone.  Did apple erase it with the newest upgrade?  Where did they place it?  I had bought a 30 pin adapter to use with my iphone 4 to project presentations while traveling early last year.  Now suddenly when moving a presentation to my iphone and holding a practice run- nothing.  Can someone please advise? 
Thank you.

Really? Not MacBooks then? I guess these people are all mistaken then:
http://osxdaily.com/2010/02/05/control-itunes-and-quicktime-with-your-iphone-ear buds/
http://cnettv.cnet.com/control-your-macbook-pro-your-iphone-headphones/9742-1_53 -50004277.html

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