Adding phone number to iphone contact - but NOT replacing! - iphone

Question

I am trying to replicate the behavior that the iphone that happens when you tap and hold on a phone number link in a text field you get a menu "create new contact" and "add to existing contact". I have this working except for one thing. In the "add to existing" apple implementation if there is already a home contact, it just adds another one. It doesn't REPLACE it. So you can have multiple home phone numbers.
In my implementation it replaces it. So how do I do a not-destructive phone number add?
Here is my code:
+(void)updatePhone:(ABRecordRef)person phone:(NSString*)phone{
ABMutableMultiValueRef phoneNumberMultiValue = ABMultiValueCreateMutable(kABPersonPhoneProperty);
ABMultiValueAddValueAndLabel(phoneNumberMultiValue, phone, kABPersonPhoneMobileLabel, NULL);
ABRecordSetValue(person, kABPersonPhoneProperty, phoneNumberMultiValue, nil);
}
any ideas?

Answer 1

Did you try querying for the existing phone numbers, and then adding your new one?
Something like this (code not tested):
+(void)updatePhone:(ABRecordRef)person phone:(NSString*)phone{
ABMutableMultiValueRef phoneNumberMultiValue = ABMultiValueCreateMutableCopy (ABRecordCopyValue(person, kABPersonPhoneProperty));
ABMultiValueAddValueAndLabel(phoneNumberMultiValue, phone, kABPersonPhoneMobileLabel, NULL);
ABRecordSetValue(person, kABPersonPhoneProperty, phoneNumberMultiValue, nil);
}