Yes, you don't want roaming fees on your main phone line (Which would be super expensive). From your device sim card settings, make sure to turn off your main line to avoid any issue with roaming fees. If you need to keep receiving texts through your main line/phone number you can optionally keep this line activated but should then make sure to turn of data roaming (remember : data is now handled by our eSIM line - that's why we bought one ;)). Another reminder : unless your main line plan says otherwise, data usage, emitting calls, emitting text messages, receiving calls (don't pick up !) and receiving MMS will generate roaming fees. Only receiving texts is free.