Sure they are both paid subscription services. You basically will have duplicate channels on DTVN that you have on DTV based on the subscription you choose. Might want to try the free 7 day trial first.
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Just make sure that if you try it and don't decide to keep it that you cancel before the 7 day trial is up or you will be charged for the next month. I don't think there's a way to get the 7 day trial without entering a payment method for auto pay. But yes, you can have as many services that you sign up for