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  1. The person_id and external_person_id columns are always treated as the same person record and must be unique (the external_person_id can be omitted if it is not used/exist).
  2. If the MDN and carrier_code match an existing person record, they will be considered to be the same Person entity. If the carrier_code does not match, then they will be assumed to be different people.
    Note
    : Since phone numbers often get ported and/or recycled, and to ensure MMA compliance, it is not a valid assumption that carrier changes are always the same person.

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