About BlackBerry ID
A BlackBerry ID gives you convenient access to multiple BlackBerry products and services. After you create a BlackBerry ID, you can use your email address and password to log in to any BlackBerry product that supports BlackBerry ID. With BlackBerry ID, you can manage apps that you downloaded from the BlackBerry World storefront and download the apps when you switch devices. You should sign in with the same BlackBerry ID on all of your BlackBerry devices.
If you previously created a BlackBerry ID, you must use it when you set up your new device instead of creating a new BlackBerry ID. You can log in to both a tablet and smartphone using the same BlackBerry ID.