Your default line for mobile data
Your default line for mobile data is either your physical SIM or eSIM, depending on which you prefer for data usage. You should set your eSIM as your default line if you’ve bought a new data package.
If you bought your data plan ahead of your trip, then use data from your physical SIM and switch to your eSIM when you arrive at your destination.
Switching between your SIM and eSIM for data can be done in your Settings. Check Section 4 for instructions on how to do so