Is anyone on FR using a smart phone VOIP app that touts their end-to-end security? Are you happy with it? I understand we are taking a lot of companies word on what they say they do, and I know that at least one (Wire) says all their software is open source and is reviewed (on the Apple App store the top rated commment for Wire implies its not that secure. And Apple's FaceTime is supposedly very secure and it is built in to the Iphone and Mac, but (a) I don't trust anything coming out of Tim Cook's mouth and...