Good afternoon thaipeanut!
I understand the importance of record keeping for your employer. Unfortunately records are not kept online for deleted accounts. Going forward on the new account, text records are available for you up to three months as long as the account remains active. Let us know if you need further assistance.
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Keep in mind, these text records ONLY include the time the text was sent/received and the number it was sent to/from. It does not include the actual contents of the text.