How I stop calendar spam or virus
The last two days I received a lot of message from my calendar, that says your phone is not protected
iPhone 11 Pro, iOS 13
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Are you seeing something as shown in pic below?
Then probably you have accepted an offer or subscribed for a spam Calendar accidentally. Watch the GIF below to know how to unsubscribe from these alerts. Look for an unknown Calendar on the device under subscribed calendars.