Using your BlackBerry ID to switch devices
When you switch to a new BlackBerry device, during setup, you are prompted to enter your BlackBerry ID username and
password. It's important to sign in using the same BlackBerry ID that you used on your previous device, because many of
your apps and settings are associated with your BlackBerry ID.
For example, when you use your existing BlackBerry ID on your new device, you can reinstall apps that you downloaded on
your previous device from the BlackBerry World storefront, if a version of that app exists for your new device.