No. Att needs to supply it. Doesn't matter if it's also one of the models att uses. The 3801 is old. I don't think att even want's them returned any more when you replace it. Call and ask for the replacement and confirm whether they do or do not want it back.
This is a public forum and I am a customer just like you. Click kudo if you feel this post is helpful and "Accept as Solution" if it solves your problem.
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Thank You for the response I will call them because it feels like I have been having overheating issues with it and intermittent internet drop off when it gets hot and the modem has plenty or airflow getting to it. So again Thank You for the quick reply