My sister gave me her 1st gen iPhone. She upgraded to a 3G. Right now I have a Samsung Propel on AT&T. It has the blue 3G SIM card. Will it work in a 1st gen iPhone? My plan isn't eligible for an upgrade yet. So can I just put my SIM card in the iPhone and everything will work or do I have to call them? I have unlimited text and MediaNet currently with my Propel. Do they just have to transfer everything over? One more question. Are they going to charge me anything for doing this?