Sync Yahoo Contacts with mobile devices
Sync your Yahoo Contacts with a mobile device so you can access your contacts wherever you go. When you sync, contacts are only added to your device's address book. Existing contacts won't be uploaded from your phone or tablet to your Yahoo Contacts.
Add contacts to a mobile device
Sync doesn't update
If your device has stopped updating your Yahoo Contacts, you'll need to delete then re-add the syncing setup to fix this issue on your device.