The information on the Contacts API YDN docs web page is conflicting
For example, the field flag does not have "HOME" in its allowed values
(http://developer.yahoo.com/social/rest_api_guide/field-resource.html#field-flag)
but it is definitely used for "home" phone number. See the example in
(http://developer.yahoo.com/social/rest_api_guide/contact-resource.html#ElementsOfContactObject)

amit