You can get access of your Yahoo Mail contacts with your phone contacts by syncing it. Sometimes users find it difficult to use these two different contact lists at the same time. Then, you can unlink it once again; use this guide and also connect through Yahoo Helpline Service Number.
Steps to unlink Yahoo contacts from Phone contacts
• Starts from your home screen
• Then, open your device's Settings app
• And tap on Accounts
• After that tap on Yahoo
• Tap on your Yahoo Mail account
• Just deselect Sync Contacts to turn it OFF