I was wondering why many people at the underpass were so eager at buying old sim cards. I began to become curious. So, when I arrive home, I got my old sim card and tried to see what could be in it that makes it so interesting at the buy and sell market very near the area where jewelers abound. I noticed something like a gold in it. I tried to tarnish it with some acids, it did not fade. Presto, it is this little amount of metal which they must be after. But, most people I know, even I have discarded out plenty already! OMG! 
