Yes. Please make sure that [Data Roaming] for the Secondary line (the eSIM plan you’ve added) is turned on.
To turn it on, go to [Settings] – [Cellular] – [Secondary] and turn [Data Roaming] on. If you correctly set the eSIM plan you just added for using cellular data and disable the automatic switching of lines, no additional fee will be charged.
How to Check the Data Roaming is ON
For iOS:
1. Go to [Settings] – [Cellular]
2. Tap [Secondary] (the eSIM plan you’ve added)
3. Make sure [Data Roaming] is turned ON.
How to turn OFF the Automatic Cellular Data Switching
For iOS:
1. Go to [Settings] – [Cellular]
2. Tap [Cellular Data]
3. Make sure [Allow Cellular Data Switching] is turned OFF.
