How to delete junk information from Apple's mobile phone calendar?

Taking Apple 1 1 and iOS 14.2 systems as examples, the specific steps to delete the junk information in the mobile phone calendar are as follows:

1. First, open the "Settings" of the mobile phone and click the "Calendar" option;

2. Click "Account" and click iCloud to enter;

3. Just delete the calendar account subscribed below.

Click "Notification" in the settings, click "Calendar", select "Invitation", and turn off the "Show in Notification" switch, so that you can delete the spam that appears in your inbox. If you want to avoid receiving such invitations in the future, you can enter the "Mail, Address Book, Calendar" option in the settings, find and turn off the "Events Found in Mail" option, or delete the subscribed calendar account.

The information function in Apple's mobile calendar is only for the convenience of users who need to remind memos immediately. Usually, it is used to send invitations to activities or meetings to friends, colleagues or family members, but it has been used by advertisers. If users synchronize the system calendar with the iCloud calendar, they may receive spam on their mobile phones, which will invalidate the spam prevention mechanism because it will not pass through the email system.

This answer applies to most of Apple's mobile phone models.