Who needs to worry about Big Brother eaves dropping when you could be violated just because you chose to be a iPhone user. In startling trending news it was reviled a bug in the Face Time software would allow someone to hear everything you say and never have to be in a room with you. The bug works by simply dialing another user, then swiping up and inserting the originating number via the “Add Person” screen before it is answered. FaceTime is tricked into believing that a Group FaceTime conference call is occurring, transmitting audio from the recipient’s device whether or not they have accepted or rejected the call.
The issue is not exclusive to the iPhone but also the Mac and iPad. Apple is very aware of the issue and they're working on a update to fix it. It will probably take about a week. So either temporarily disable your Face Time feature or switch to Android.