I just got my Series S and Series X yesterday. I noticed I only had 300GB of data left on my plan (I have a 1.25 TB plan) for the month so I upgraded to unlimited for the month and will downgrade next month.
If you are on a data cap plan make sure you check so you don't get charged overage fees.
If you are on a data cap plan make sure you check so you don't get charged overage fees.