What the heck is a security pin?

I'm trying to activate my iphone on the straight talk website, and their asking me for the security pin, i don't know what that is or were its located. I asked my mom and she doesn't know either, can anyone help?

The security pin is a group of numbers found on the back of the iphone. Remove the battery and read the info on the phone.
Or else, check the manual/instructions.
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