Samsung 9308 has deleted the SMS. Why is there a record? How to delete SMS records?

How to completely delete the contents of SMS records;

Enter the phone is the dial, select the record button at the top, click the touch button in the lower left corner of the phone, select View, and then select all information, including the information sent and received by the phone. After selecting as needed, click the touch button in the lower left corner of the phone again and select Delete.

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