I work at an electronics store and we deal a lot with sim cards, so i was looking on the internet to learn more about them and i found this interesting page about cloning sim cards. It's very interesting and i might make it soon after i am done with my project to electronically control my house. Also if you do decide to use this make sure it's for fun and not to harm anyone like the article says and i am not responsible for how you use it.
http://www.5ne.org/sim-cloning/
All of this information is open and i am allowing anyone to do anything they want with it without requesting my permission. However, I am not responsible or liable for any damages or loss you cause with the use of this information and i am not guaranteeing that this will work. Use at your own risk