There are three ways you can find the imei and pin of a blackberry, there are certain instances that you'll need either you pin or imei no. to perform a task, that's why i'm writing this information. Most of blackberry users that don't know how to find those two.

How do i find my pin and imei?

In your blackberry device, go to settings and then click on status. there you'll find both the two.
You can check the pack that your blackberry device came inside.
Turn your device off and remove the battery and you'll find a sticker which contain the information.
I hope this helps!!

source: http://www.arewatech.com/2011/12/how-to-know-imei-pin-of-blackberry.html