It looks like Apple would have enough log data to determine if anyone exploited this bug, if they decided to inform victims they probably could do so. I guess we'll see.
https://twitter.com/zackwhittaker/status/1090269576082800641 …
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Replying to @taviso
Too many false positives ? Like the call failed, and people put their phone down, not knowing about the bug ?
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Replying to @ppcqua
Hard to believe there wouldn't be a "new group participant xxx" event log, and if new participant matches original caller or event occurs before "call accepted", inform recipient they were spied on. 
7:43 AM - 29 Jan 2019
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