Can you keep old BBM Pin when switching to iPhone or Android?

Many people ask if they can keep the same BBM PIN when switching to iPhone and what can you do. When you switch from BlackBerry smartphone to a new device like iPhone or Android, you will be assigned a new PIN for BBM.
That means your old BlackBerry Curve 8900 PIN is assigned uniquely to that device, and is not movable. But you can use your old BlackBerryID email on the new device.