Step 1. Load your contacts file
Export a vCard file from iCloud Contacts then drop it here. On a computer, sign in at iCloud then go to Contacts and use Export vCard.
Step 2. Review the headline numbers
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Conflicts to review
Step 3. Resolve conflicts across different contacts
Each phone number must map to one name only. When the same number appears under several names, pick the name to keep. The number will be removed from the others.
Step 4. Trim multiple numbers inside one contact
If a contact has many numbers, untick the ones you want to drop.
Step 5. Apply clean up and export
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