Hello Micaella,
Welcome to the community!
Sorry to hear you've lost your SIM card. I assume the same number to which you refer is your phone number? If that is the case, then yes, the physical SIM and/or eSIM only identifies the device to the network and associates the device with your account / line. Updating SIMs (physical or eSIM) has no bearing on the phone number assigned to your line.
That said, I'm not sure how easy updating your SIM card information is going to be given you are currently outside of
Canada. You can order a new SIM card through customer service, however, I don't believe they will be able to ship the SIM card outside of Canada. Even if someone were to purchase a SIM card in-store and forward it to you abroad, you might not be able to update the SIM card information on your account.
In general, customers are able to manage their SIM card information via My Account --> My Usage. From your Dashboard, the option to Manage SIM is near the bottom of the page under Quick Actions. However, since you have lost your physical SIM card, I don't believe you will be able to use the online system update the SIM card information or to obtain an eSIM. Part of the process requires responding to a verification text sent to the current SIM, which you unfortuntely no longer have (see here and here). That requirement is to prevent SIM-swap fraudulent activity. Usually, customers in similar situations would need to go to a store to obtain a replacement SIM or eSIM so their identity can be verified.
If you haven't already, you might consider reporting your device as lost or stolen (see here and here). That would prevent any unauthorised usage on your line.
You should note these forums are community-driven and not intended as a venue for customer services. We would not have access to customers' accounts nor are we fully aware of all procedures. If you wish assistance with your matter, you would need to contact customer service. Since you are outside of Canada, they do have a number you can call from abroad. In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above.
Hope this helps 😀
Cheers
