Top-up packages allow you to continue to use the eSIM after the first package is expired or used up (not all operators offer this option). 

When purchasing a top-up it will automatically assign itself to the eSIM you are currently using. No need for a new QR code or any activation steps!

How it works:

The package that will be used is the package that expires first.
For example, if there is a yearly plan on the eSIM, and the top-up is for 30 days, the top-up will be consumed first. 

When you purchase a top-up, it will not extend the first eSIM package but will apply the new package with the mentioned data and new validity.