Hello Steveintravel,
Welcome to the community!
Sorry to hear your son has lost his SIM card overseas. I believe you should be able to order a new SIM on Fido.ca and have it shipped to your billing address (see here). While they can also ship the SIM card to an alternate address (see here), I'm not sure if that address can be outside of Canada. Alternatively, you (or he) can go to any store to purchase another SIM card. You should note that the new SIM card would not yet be associated with your account. That's why anyone can purchase a SIM from a store. Once received, you would need to update your SIM card to the new one. Since his old SIM is lost, you would need to contact customer service to update his SIM. 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
