When I first did my upgrade program, I was with T-Mobile, no big deal. Now I am not with one of the major carriers (I am using Mint Mobile on the T-mobile network). When I look at getting pre-approved for this round, I have to choose one of the major 4 and then apparently have to have my number setup / transferred? I am confused on this. Can anyone shed light on this for me? I don't see anything in the FAQ on Apple's webpage. I Know I can just put my SIM in and be good to go, but I am still confused with having to choose one of the 4. Anyone else in this boat or run into it last year????