power the phone off one of those luggable "Jump Start" packs,
I've got one of those, more junk to trip over sitting next to the drivers seat. I've also got a couple of Anker power packs which are the size of a pack of cigarettes that would work as well. Just trying to eliminate the amount of junk around the drivers area. **** phone clamp blocks view of the stereo, then fell off while driving.
I might try one of the dc line filters if I feel ambitious enough to pull the dashboard apart, it's a PIA, but doable if I feel like it. I also found the audio line filter, but supposedly it messes with the sound quality. There's also a cigarette plug adaptor with a built in filter, but it's like $45 and more **** hanging off the dashboard.