I am having the same issue. I only use Xfinity Hotspots or my home wifi (Which is Xfinity). Occasionally I use a free hotspot at the library or hospital. I am always charged an extreme amount of usage. I have a ticket in with them and waiting to hear back. I had another carrier before this and never hit 2gb of data, now that I am with Xfinity I am racking up 4 plus gb a month!!!!! Something is definitely fishy.
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