Simultaneous connection (PC and phone) to same Zoom session

Hi @BewilderedBob - welcome to the Zoom Community.

Absolutely. You can use your PC for the video and your phone for the audio in the same Zoom meeting, it's the perfect workaround for a faulty mic.

1. Open the Zoom meeting link on your PC and join the meeting with video only
2. When the audio pop-up appears, or by clicking the microphone icon's upward arrow, choose “Use Phone for Audio” (Note: Please don’t select "Join with Computer Audio”)
3. Your Zoom screen on the PC will now display the information needed to join the audio, including a Dial-in Number, the Meeting ID, and your Participant ID
4. Join the Meeting from Your Phone (Audio Only) by Opening the Zoom mobile app and call the Dial-in Numbers provided on your PC screen and just follow the voice prompts

I hope this helps, thank you. 

I was able to join Zoom meeting in other way than Arleen mentioned (although I didn't think it was possible 😉).
What I did was:
1. Joined the meeting from my PC client. In audio/video settings window that shows before joining I've selected "No audio" option.

2. After that I've joined from my mobile Zoom client logged to the same account. Select a desired meeting from calendar and click blue Join button, not "Switch" that is being shown on top of screen when you are in "Home" tab.
In there I had my camera turned off, but audio was selected.

Order of joining does matter.

As a result - I've joined meeting twice, with camera enabled on my PC and with audio from my mobile device. Order of joining