Earplugs or phone?

I got some new, off brand earplugs, and every time I move or the cord moves my phone will go to Siri, fast fast forward a song, change songs, pause, ect. This has also happened with other earplugs but I don't know if it's because of the earplugs or just the phone itself (a regular 6) I've had the phone for a year now. I've tried resetting my phone and reset my settings it none of that has worked. I have also had some other problems with my phone lately (vibration is weird) and that makes me think maybe it's the phone and not the brand of earplugs.