Yeah, unlike iCloud, you'll have to use iTunes on a computer to set it up and you'll have to to sync with iTunes to update to saved contacts. There is a Sync Contacts box under the Info tab in iTunes. It's a subpar method when compared to iCloud. If you add a contact with iCloud enabled, it will immediately push new/updated contacts to your other devices and save them in the cloud. If you do it with Yahoo, it only updates it as often as you connect to iTunes and sync. If you're sticking with iOS I highly recommend iCloud. If you're switching to Android, I recommend syncing them with Google instead of Yahoo.