I sold my 32 GB iphone 4s for $550 and am trying to figure out the most cost effective way to buy the iphone 5. So if I start a second line and use the full subsidy to buy the iPhone 5 how would you get it switched to the # I use now. Can I just order the new nano sim for the number I have now and them switch the sim cards. If so then I will have one line with my old data package and one with my new data package or if I go this route will I have to switch to the new mobile share and loose my unlimited data package. ANy advice from someone who does this would be appreciated. Thanks