Hello @Lakelife19, and thanks for reaching out to the community for answers!
That is a very interesting question. Let's check look into it!
If you are receiving or using iMessage/Advance Messaging or a 3rd party source, these would usually not appear on your MyAT&T log history but data usage. These would also be the same when using social media apps such as Twitter message, Facebook Messages etc.
We hope this information helps, and have an awesome day!
Dwight, AT&T Community Specialist
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