SIM card PIN Code - Razr V3

I'd apprecite some help.

I recently got a V3 (Cingular). The manual mentions a SIM card PIN
code. Since I did not get a code from the place where I bought a phone,
I call Cingular customer service and asked for the code. The customer
service rep would not give it to me for "security" reasone. Is this
normal?

I'm thinking I own the phone, including the SIM chip, and hence have a
right to have the code.

I'd appreciate some comments from those with more experience with cell
phones.