I obtained the SP Visa last March in a 3BM. I just did a 3BM this month which included the SP MC. I received a letter stating that I was not approved for the SP MC because I already had the SP. The letter asked me to call to discuss my credit.
So, I called the reconsideration department and had an easy time telling the agent about the benefits of having both the Visa and the MC and moved some credit over to get the new card open.
looking at my credit report today, I see that this call in triggered another Experian Inquiry listed from FIRST USA,NA having the same phone number as the Chase inquiry the week before.
Oh well, at least it got approved, but I was hoping for a single inquiry not two.