There is usually no problem swapping cards between receivers on the same account. You would only have a problem swapping a card that was previously active on an account other than yours, such as when purchasing a used receiver on ebay that comes with a used access card. Even then, DTV has been known to activate used cards. It all depends on who you get on the other end of the line when you call DTV. If the CSR says he or she can't swap the card, hang up and call back. You'll eventually get someone that will do the swap for you.