How does iPhone 6s merge duplicate contact information in the address book?

Find duplicate contacts in the address book, click Edit, and then click Link Contacts to select duplicate contacts.

The steps for iPhone 6s to merge duplicate contact information in the address book are as follows:

Open the address book and find duplicate contacts;

Click "Edit" in the upper right corner;

3. Click "Link Contact" at the bottom;

4. Select the contact person to link;

5. Click the "link" in the upper right corner;

6. Click Finish.