Companion app with two iPhones

Can you have zwift running on one phone and use the companion app on another phone to control phone 1. I have an old phone that I would like to use to control zwift but would like to have the option to use the companion app on another phone to control it.

That’s exactly how it works. The companion app has to be running on a separate device from the device that’s running Zwift.

Appreciate the clarification… thanks!