No, you cannot use your Mercury Credit Card instantly after approval. You’ll have to wait for the card to arrive in the mail and activate it first.
Having said that, once you're approved for the Mercury Credit Card, it should take around 7 to 10 business days to arrive by mail. If it's been longer than that but you still haven't received you card, you should call customer service at (866) 686-2158 to check on it.
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