If you have been following the NSA and related stories, you will understand that every phone call you make, whether it be on your landline or mobile/cell phone, is being recorded and swept up in the global data collection machine. Often you will not care, but sometimes you may. There have been encrypted calling options available for some time, but they have either been complex to use and/or require a special phone or a licence fee. A free and easy-to use solution that has been available on Android phones for some time (called Redphone) has now been released in a more refined form for the iPhone as Signal.
This article provides a good overview and this one provides more detail. I have been watching this emerge and I commend it to you.
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