As of May 2019.
Two cameras. The iPhone can be remotely controlled by my Apple Watch 3.
I’m trying to use voice control as much as I can for the GoPro.
I have GoPro attachments on both bike helmet and bike handlebars as well. All mounts can attach either GoPro or iPhone.
What’s lacking most is the ability to ZOOM with either camera. I MIGHT carry a small camera with zoom, as well. I like zoom for distant animal sightings. And for Gymnastics.