Will it work if I downgrade to a 2G iPhone by putting my sim in from my 3GS? Once AT&T OLAM identifies it as a 2G iPhone, can I go in there and switch it to the $20 unlimited + 200 SMS and then proceed to upgrade to iPhone 4 with grandfathered unlimited?
I'm actually still on medianet and feel like if I try to cut sim and put in in iPhone 4, my plan will automatically get switched to 2GB limit.