Use the ByeRoaming travel eSIM for cellular data and disable Data Roaming on your home SIM. Your home carrier can still charge if the home line is allowed to roam for data.
Checklist
- Set Cellular Data to the ByeRoaming travel eSIM.
- Turn Data Roaming off on the home SIM.
- Turn Data Roaming on only on the travel eSIM.
- Optional: turn off the home line for data entirely, or enable Low Data Mode / disable mobile data for the home SIM.
- Confirm you are not enrolled in an automatic international day pass you do not want.
Calls and SMS on the home line may still incur charges depending on your home plan — check with your carrier. Setup help: Keep home number with travel eSIM.