illni07,
Brooklyn 19 is right in that you’r kids can find out your social security number if they want to, unless you keep the card locked up in a safe and never in your wallet or pocketbook and never say it, and even so there are probably ways i cant think of right now to find it out.
Jphone,
you would be shocked at the type of things kids will do especialy if under peer pressure for whatever reason.
The only thing is that even easier then all that (probably) is for a teen to just walk into a store and get a pre paid phone themselves and not tell there parents anything about it! so it is probably better just to get one for your kid and at least have some control over it unless you are really sure he wont get one himself.