Shutter sounds on mobile phones?

Um, no. There have been a couple of bills introduced in past years to do that, but those bills went nowhere.

• H.R.3488 - 110th Congress - 2007 - died in subcommittee
  
• H.R.414 - 111th Congress - 2009 - died in subcommittee
  

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The open-source LightZone Project: http://lightzoneproject.org/