In the unlikely event that you exceed the allotted 3 GB of high-speed data, you may purchase a data top-up card through your supplier. Top-up cards will add an extra 5 GB or 10 GB of data to your domain, with one-year validity. When an HMI reaches its data cap for the month, the data from your top-up card will “kick in” and be consumed to maintain your high-speed connection.