My calendar didn’t transfer to my new phone. Any ideas?
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Calendar:

The way to solve this is to compare which email accounts are hosting calendars that you use. This means we compare the settings of an old device to the new phone. Two candidates to do this are A: the old phone if it's still available. B: the computer. (If the calendars are on your iPad then that would also work)

A: if the old phone still exists, go to Settings/Passwords and Accounts. Now go through each email account and see if Mail, contacts, calendars, are turned on. Now match those settings to the new phone.

B: if you would like to compare your calendars to your computer, open Calendars then look on the left side of the calendar. Each email account that has calendars active will show here:

You can also go into System Preferences/Internet accounts and select each email account there just like you might have on your old phone. That will also list which email accounts you use to sync calendars. Note that it's ok for multiple email accounts to have calendars turned on.

Finally, go back to your new phone and check to make sure that all the same email accounts are added and that calendars are turned on for each of those same email accounts that are active (or that you actually use).