How to Remove Duplicate Contacts in iPhone iOS10
For those that only need to remove several duplicate contacts on your iPhone, the best option is to merge your contacts so all the information will be in one place without re-typing it.
Step 1. Turn on your iPhone.
Step 2. From the Home screen , open the Contacts app.
Step 3. Select on one of the contacts that you want to merge.
Step 4. Tap on Edit.
Step 5. Browse and select on Link Contacts that has a green plus sign next to it.
Step 6. Select on the second contact and then tap on Link two link both contacts.
Step 7. If you want to unlink contacts, then just tap on the red minus sign.
Step 8. Finally, tap on Done to exit the contact entry.