I just received my new iPhone 5s. I haven't activated it yet. I am guessing I can't use my old sim card from my Samsung galaxy 3s and (from what I have read in this forum) can do all the activation hocus pocus in self serve (please correct me if I am wrong). What about phone plans, do they get transferred automatically? I keep reading "the old plans are better" but when I look at mine I can't really believe it. There appears to be a couple different "sets" of plans available - almost the same but not quite. I find this all very confusing. Any advice about how to choose??