In the past, the code on this card was used to activate the 1-year subscription that comes with your Core.
We've updated the way that this works to simplify the process. Now, your subscription will automatically begin as soon as your pair your phone to your new Core device for the first time.
So, there's no need to worry about this card; you can safely throw it away.
If you have any questions about your subscription or how to activate it, feel free to contact customer support.