If you have agreed to share information with a third party, then you have no reasonable expectation of privacy.
Smith vs Maryland http://supreme.justia.com/cases/fede.../735/case.html
United States vs Miller http://www.oyez.org/cases/1970-1979/1975/1975_74_1179/
Such sharing may be explicit, as by signing that contract with a cellular phone company to get teh shiny, shiny new phone, or clicking "I agree" to that hundred page legal tome iTunes presents you with on updating or installing. It may be implicit, as when you key in a telephone number on equipment attached to the apparatus provided by a third party (the telephone system).
Remember this when you click 'I Agree' on that shiny new XBox One (with built-in microphone and camera) after you set it up in your living room, or that cool new Internet-connected Samsung TV with speech and gesture recognition when you install it in your bedroom. (And you didn't even question just how the gesture recognition works, or why it only works when the TV has an Internet connection?) But not to worry! Microsoft says the XBox can be configured for privacy, so it won't watch or listen to you until you say "XBox on!" Um...
Happy Goldfish Bowl, everyone!
Oh, me? I'm just moving to a nice quiet cabin in the woods.
Nothing could go wrong with that plan...