Utah Code § 75-5-208

By accepting a testamentary, instrumental, or court appointment as guardian, a guardian submits personally to the jurisdiction of the court in any proceeding relating to the guardianship that may be instituted by any interested person or any person interested in the welfare of the minor. Notice of any proceeding shall be delivered to the guardian or mailed to him by ordinary mail at his address as listed in the court records and to his address as then known to the petitioner. Letters of guardianship shall indicate whether the guardian was appointed by will, written instrument, or by court order.