This article explains how to delete a calendar on your iPhone and add it back if you change your mind. The instructions apply to all iPhone models.
How do I delete calendars on iPhone?
You can easily delete an iCloud, subscribed, or Google calendar from your iPhone, right from the Calendar app. If you don't see the Delete Calendar option described here, skip to the next set of steps to delete a calendar in Settings.
Open the Calendar app on your iPhone.
Tap Calendars at the bottom of the screen.
