With Mac to Mac Screen Sharing and helping plug in (their) iOS device via USB cable to the Mac they are sharing screen.
Screen share an iOS device using a Mac
This is a fun, modified use of a developer feature that Apple built into QuickTime Player in 2014. When you use the Screen Sharing Mac app with this screen casting feature, you can see everything happening on an iOS device as long as both parties have Macs.
- Start a Mac screen-sharing session.
- Have the person you’re helping plug in their iOS device via USB cable to the Mac that they are screen sharing with.
- Have them launch QuickTime Player and click File → New Movie Recording.
Once the movie window opens, select the drop-down arrow next to the record icon and click the iOS device you’d like to see, then click record.
After you’ve solved all their issues, you can even help them save the footage so they can review it later as needed.