iPhone mysteriously connected to UltraStudio

Both bluetooth and WiFi have been turned off on my phone but whenever my phone rings, the mixer lights up and rings too. It is connected to my Blackmagic UltraStudio 4K and when I turn it off, the mixer doesn't ring.

What is happening here?

P.S: The forum doesn't let me post the video or the link though to show you?

Links and videos can be posted after 10 or more posts on the forum. This a spam bot prevention system.

I want to see that video.. Just amazed that this would be possible.

PM me the link. I can post it for you.

Please do send it to Daniel, I want to see this

I wonder what is the setup? You have the USB from the phone connected to the Ultrastudio 4k Mini USB port??

Here the video. https://streamable.com/z6nhv

I wonder what is the setup? You have the USB from the phone connected to the Ultrastudio 4k Mini USB port??

Here the video. https://streamable.com/z6nhv

I was just charging my phone. It's connected to a charger, not to any device.

RFI Induced interference.
https://www.rfvenue.com/blog/2015/05/06/how-to-prevent-cell-phones-from-interfering-with-audio-equipment