Primary Phone Criteria
A constituent can only have one primary phone number. In the Primary phone criteria field, you select whether to preserve the primary indicator on the source or target’s primary phone number. If you select “Target’s Primary Phone,” the merge task associates the source’s primary phone number with the target but preserves the primary indicator on the target’s primary phone number. If you select “Source’s Primary Phone,” the merge task preserves the primary indicator on the source’s primary phone number.