Gert van Dijk on Nostr: My bank has an option to start a regular call from their mobile app (logged in state) ...

My bank has an option to start a regular call from their mobile app (logged in state) which they say is an "authenticated call". I will not have to provide any details on the phone with the service agent anymore.
The button opens my regular Google Phone dialer app.

HOW does that work? I mean, it's just my dialer calling a landline number. Can you send (hidden) metadata through the dialer app on a plain cell phone call? 🤔