You go to straighttalk.com and make sure your phone is compatiable, it will tell you what kind of sim you will need. Then you follow the prompts on the webpage after you get the sim to activate it and change your apn settings. Its simple took me all but 5 minutes to transfer and iPhone over to straight talk.
After you receive the Sim you activate it! You can't activate it until you have it and the special code that is on the package. So when the person who wins this auctions get the sim card they go to straighttalk.com and activate it. You should be sure to check to see what card your phone needs I got one that was wrong and had to get a different one for my iPhone.