It definitely sounds like this is an important concern for you; we're happy to help. Text history is available on My Verizon, though limited to previous months' usage. You can access history by logging into My Verizon>Usage Details>Select the dates you want to retrieve the history from and the number. It's important to be aware iMessages will not display in the history and content is not available, just numbers and dates.
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That's a great question that I'm happy to help with! You can set up a "hard stop" on your data by using FamilyBase. Check out the full details of this feature right here: http://vz.to/WjZ8ZL
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