I left the phone locked, sitting in a dashboard compartment in my car, while I went inside somewhere for 10min. When I got back in the car my friend held up the phone, saying it was making noise and looked like it called someone. Sure enough, on the lock screen it said "ongoing call" but it ended as soon as they showed me. I checked the phone app and it showed a 4min call to a contact I haven't called in months (who confirmed they got the missed call + long voicemail).
Additional context:
- Pixel 8 Pro, very barebones mainstream GOS install with barely any apps a little over a week ago. No weird hacks or customizations. Installed via the official web installer, attested and verified.
- Google Fi is my carrier.
- Yes, I do have sandboxed Play Services & Store installed, as well as a few Google apps where I'm willing to live with the privacy tradeoff for features/convenience/sanity's sake: Calendar, Camera, GBoard, Messages, and Phone. Google's Phone app is set as my default, and it's the app that made the call.
- Apps with Phone permission enabled: Contacts [GOS], Google Fi, Google Play Services, Messages [Google], Messaging [GOS], Phone [GOS], Phone [Google], Settings.
- The phone was not connected to anything physically or wirelessly, except 5G. It's not even paired with my car for Bluetooth.
- There's no Assistant or any sort of voice-activated services configured on the phone.
- My friend swore up and down that they didn't touch the phone at all and I believe them. Even if they had, the phone was locked so how could they have started a call to a random contact?