Except that, using Chewing gum you can do next to nothing to others, putting the gum in their hair is as disastrous as you can get. Using SIM cards however, you

Except that, using Chewing gum you can do next to nothing to others, putting the gum in their hair is as disastrous as you can get. Using SIM cards however, you can co-ordinate a terrorist attack. In a country of a billion people tracing a phone number that is not verified by any identity is like looking for a needle in a haystack. It can be done, but takes a lot of time. So while systems similar to SSN are put in place, the govt has made it very hard to get a SIM, until a better system is in place.