Voice Control Keeps on Activating

I have the iPhone 6s Plus and mine does that all the time. Drives me insane.

I had this problem too and tried all the suggestions to fix it, without success. The only thing that finally worked was changing headphones. The iPhone didn't like my skull candy headphones - which caused Siri or Voice Control to constantly intervene in my music playing when I hadn't requested or tried to use it - but when I used different headphones the problem stopped. The new headphones that cured the problem are not Apple's but some crappy cheap things I bought from Sport Direct for jogging. So if all else fails, just try different headphones!

I had the same problem too I just cleaned the aux entry with a tiny wooden stick.

Try turning Siri off in settings, it might kill you to do so, but it fixes the problem :)

Your statement is not accurate as I've had this same problem with three different headsets, none of which had a microphone.

And I haven't used earphones at all. Still phoning anyone it feels like. Tried turning anything voice related off but it just carries on