is there a charge to use tv on the go

Not from Xfinity, it’s part of your services. Unless you choose something from On Demand with a price

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@linea wrote:

will i get a bill for using tv or dvr on the go away from home

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You shouldn't.  That is part of the Comcast/Xfinity service.  That doesn't mean if you use your cellular device to access Xfinity TV GO, it won't affect your cellular bill.  Data usage by whatever network service you use may be affected.