I currently have my phone service with T-Mobile and want to move my wife and two kids away from Sprint and onto a Simple Choice Plan with me. I went to a store yesterday and was told that for all three of their phones I need to purchase a sim kit for $15 each. When I look online it appears that I can purchase the SIM starter kit from T-mobile for free. My question is if they will allow me to purchase 3 iPhones in the store and let me use my SIM cards that I purchase online? Does anybody have any experience with this?