You've asked a good question. Your text usage history can not be edited in the online or billing history. You can only delete messages from the phone. Keep in mind that the billing and usage information does not include message content. Does this answer your question?
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That's a great question, yubaduba91. Text messages are shown in the activity section of your My Verizon Page, and they can be viewed by the Account Owner as well as the user of the device in question. While call logs are included in your detailed bill, individual text message metadata is not included in your monthly bill. The data for a text message is not affected by whether or not it has been deleted from the device. Is this information useful?