Calendar
A very disturbing calendar showed up in my calendar on my iPhone. How did it get there? Is my phone or info on it compromised?
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Somewhere along the way, you got a “do you want to get alerts” message and chose to accept a calendar.
This is common. There’s no compromise, no virus, no malware, just a shared calendar that you now don’t want.
To unsubscribe to the calendar, see the spam calendar subscription section here:
Scam Pop-ups, Scam Viruses, Scam Receipts… - Apple Community