I applied for the Chase United Explorer card on 3/6.
I immediately received the 7-10, then the 30 day email and the automated system continued to say 30 days.
Finally, literally just 3 minutes ago, I received a call from an 844 number. It was the Chase fraud department, wanting to verify that I did, in fact, apply for this card. He then sent me a text and I had to verify the code.
Upon verification I was told "congratulations Mr. Hokies, your application has been approved for $5,000."
Just further proof that calling is probably a BAD idea.