If the "Unlink" option is not available on your device, follow these steps: 1. Open the Contacts app on your smartphone. 2. Find the contact you want to delete. 3. Tap on the "Edit" option (usually represented by a pencil icon). 4. Delete the contact's phone number and click on "Save." 5. Go back to the contact and tap on the three-dot menu. 6. Select "Delete" and then "OK."