How do I fix my contacts to remove duplicates

Remove duplicate contacts

1. Make a copy of your contacts.
2. Open Contacts.
3. From the Card menu, select Card > Look for Duplicates.
4. When asked, click Merge.
5. Repeat steps 2 and 3 until no duplicates are found.
6. Make another copy of your iCloud Contacts.

If you see duplicate contacts after setting up iCloud Contacts ...

If you have the same contacts stored in multiple email accounts and if you add these accounts in an iPhone it may display as duplicates.

Contacts are neither stored locally on an iPhone nor in SIM. They are synced to an email account that you had Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other

Don’t sync contacts from all of your accounts.