I have a continuing message from the calendar app even after I deleted the app telling that my iPhone is in Danger
Please refer to Delete spam calendars and events on iPhone - Apple Support.
Please refer to Delete spam calendars and events on iPhone - Apple Support.
You have a subscribed calendar, not a virus. You were offered events and notifications from some website, and accepted that offer. Re-load the Calendar app using the App Store, and the use the app to unsubscribe from the calendar. Tap or click on the following blue-text link for details: Delete spam calendars and events on iPhone - Apple Support. The color of the events popping up will match the color of the subscribed calendar in the iPhone list of subscribed calendars, too.
Your phone is not in danger, that is calendar spam. You got tricked into installing a rogue calendar.
If your phone has iOS 13 or earlier: Go to Settings/Passwords & Accounts, look under Subscribed Calendars, tap on the offending calendar and delete it.
If your phone has iOS 14: Go to Settings/Calendar/Accounts, Tap Subscribed Calendars, tap on the offending calendar and delete it.
And in the future beware of "free" offers
Calendar virus
