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Concern moved here to the Customer Service help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.

@user_vm58ap

Thanks for reaching out to us, the best way to see your data usage is if you're using the Xfinity modem you can see each device and you can connect that device with a profile name that way you can monitor which devices online the most.

But as far as what device is using the most data or how the data is being used that would be information that we wouldn't be able to access to.

Also if you're not sure who's using the data it's always a good thing to change your Wi-Fi password name

You can also reach out to out Xfinity customer security assurance team  https://spa.xfinity.com/contact-us 1-888-565-4329