Urgent alert in phone

The message is a scam.. Do not download anything based on such bogus messages.

If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account. 

If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account. 

The Apple support article is below. 

https://support.apple.com/en-us/HT211076

hillari ~

Delete spam calendars and events on iPhone - Apple Support

...found by searching Apple's Knowledge Base.

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是的，iOS系统十分安全，无需担心。

可参考：

Yes, it is. iOS is safe. Don’t worry about it.

https://support.apple.com/zh-cn/HT204759