A flagship smartphone phone will always look better than this webcam. It's a great option to have. But if you are actually doing calls on a regular basis, you want a dedicated device. Here's a recent article about it.

https://www.ikream.com/2019/07/use-iphone-webcam-pc-mac-apps-24815

Verdict

As you can see, you have at least a couple of options for using your iPhone as the webcam for your PC or Mac; however, the best way to use a webcam for a conference is to probably purchase an external one to attach to your PC or laptop. Viewers on the other end will get a much better experience, than you trying to hold your iPhone up for an hour for other viewers to see you.