Originally Posted by
chromag
I find that turning off a SIM or eSIM entirely is the best way to prevent any undesired usage. It's a really useful feature. With the current daily roaming rates of Canadian wireless providers ($12/d for U.S., $15/d for international) I prefer to have my home SIM disabled entirely rather than have only specific services (e.g. roaming, data) turned off.
I've called in to the carrier to disable this feature from automatically activating while out of the country. Chances are the one time charge you'll have to pay for accidentally using the service is a lot less than the 12/15$ you'll have to pay for the day's roaming.