First one with my Vantrue N5 camera. And, my second time driving with it, caught this. Did 720p for the full length.
Rear view - You can see that they are gaining on me at high speed. As they pass, you can clearly see phone in their hand.
Front view - Did the full video so you can see it was not another car. One pass on right, then two failed pass on right, then 3 lane changeover, followed by tailgating pickup. Probably all while on phone.
Added slowed down version of rear so you can dee phone in hand.