My friend told me about this more than a year ago. Didn't believe his crazy tinfoilhat conspiracy.
Fast forward : Now i'm the tinfoil loon telling people that "they" are listening in on everything we say.
I'm just sorry that I didn't listen to what my friend was trying to tell me. But hey, at least "they" were listening.
Sometimes it takes time for the truth to sink in and that's okay. Have you told your friend you believe him now?
I told him. But not in front of our phones :)