Ok, expecting my "machine" any time now. In the past I have always had my carrier switch things over from my old phone to my new one. My son tells me there is a way to do all the switching over without taking it in. Unfortunately he is at work and can't help me today. So, do I just switch the cards in the phone over to the new one? I don't want to lose my contacts and pictures. Aren't the SD cards different sizes from the Galaxy S which is what I have now, as compared to the S3? I want to get everything right for setting this up. Can you help?