What can cause roaming charges
Mobile data used by the main SIM instead of the eSIM
Automatic switching between SIMs for data
Background apps using mobile data before the eSIM is set as active
iPhone
Go to Settings → Cellular
Keep both SIMs ON (main SIM + Travel eSIM)
Cellular Data → select Travel eSIM
Cellular Data Switching → OFF (prevents automatic fallback to main SIM)
Main SIM → Data Roaming → OFF
Android
Keep both SIMs enabled
Set Preferred mobile data SIM → Travel eSIM
Disable mobile data on main SIM or turn off its data roaming option
Disable auto switching / smart switching if available
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