How do I find a SIM PIN to enable SIM card lock?

[xoxemmaax3]

I am trying to use my Sidekick 2009 lx with an at&t SIM card and need to find the PIN number. How do I obtain this information?

 

[ThatVietGuy]

By calling AT&T or whoever you got the SIM from.

You're not getting help from here about that.