People Asked How Sim Card Function

I think you have to experiment on the satellite dish and its decoder which paid TV programmes give you when you subscribed on  TV programmes provider. You realize there are chips for identification of user in satellite dish and its decoder from paid TV programmes provider, you experiment on the chips for identification to make another edition for handphones, standard sim cards, I think the handphone function like satellite dish and its decoder from paid TV programmes with their user identification chips installed on the handphone, so you need to make a standard size for your usage, then another edition of smaller size for other people to use.