That is a fantastic question, and we would be happy to provide you with the answers! The feature that we believe should help you out the most is called MAC Filtering. Once implemented, should make sure that only devices that you have specifically allowed on your network can access it, and use your Wi-Fi.
Please note that you will need to gather the MAC addresses for all of your devices yourself, and that each method for obtaining the MAC address is dependent on the device. Refer to your service documentation or manufacturer’s website for detailed instructions on where to find this information.
We hope this helps!
Alexander, AT&T Community Specialist
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