No (you can just do it via SM). No.
approved! when I cancel via SM, do I move the CL over or just drop it? Is there a chiluk between Cit, vs chase, amex? or is it the old machlokes about whether its easier to get approved with less credit? data point- I applied and it said I had to call, when I called the rep said I see you have 33,000 of credit between your 3 cards, and then said so I can approve you for another 11,000, its mashma that if I had more credit it would have been harder to get approved