Once you use up 80% of your data package you will receive an email from Red Bull MOBILE with the option to top up your data plan. You will only be able to top up your data package if the eSIM is still installed on your device and is active. If you want to purchase data for a different destination, you will have to purchase a new eSIM data plan.
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You should avoid doing so. The eSIM is associated with your data plan, and deleting the eSIM app will delete your phone’s data plan.