I can't imagine this is connected to GrapheneOS in any way, but I'm hoping someone here can help me understand what's happening.
I am running GrapheneOS on a Pixel 8. Today I was listening to Spotify through a bluetooth headset. I had paused it to have a discussion with someone. When I went to unpause, my headset announced something like 'recalling number' or something like that. Then a phone call ringtone started, as if I was calling someone. I hung up immediately. The number dialed was '*671XXXXXXXXXX'. The X's are real numbers that I can't imagine are relevant here.
I looked back through my call history and found more *67 calls. 1 on February 5th to the same number. The call duration was 45 seconds. Another on February 5th to another number, duration of 12 seconds.
I am not making these calls. I've never used *67. Can anyone shed some light? How can I figure out what's happening? Maybe someone spoofing my number to spam others? The numbers called all share my area code. But I can't imagine how that would show up on my device if that's what's happening.