04-12-2011 01:26 PM
Each BlackBerry device has a unique electronic serial number (ESN) and Personal Identification Number (PIN). It is used for various features of the blackberry including BIS account for email requires both the IMEI and PIN to function properly. Also, when you add someone to BBM (BlackBerry Messenger) it adds them via BlackBerry PIN.
Hope this helps,
04-12-2011 02:03 PM
PIN: C0001B7B4 Display/Scan Bar Code
PIN: C0005A9AA Display/Scan Bar Code