I feel like I need this every… seven years or so. Just long enough for me to forget how to do it.
Do you have a Google Calendar that has been shared with you but need it to show on your iOS native calendar app? Have no fear! Let’s go back to circa 2009.
Sign into your Google account and visit this URL: https://www.google.com/calendar/syncselect
Enable the calendars you want displayed on your iOS device. Go back to the iOS calendar and select “Calendars” at the bottom. Pick your calendars and save your settings.