Hey @Ting6, you can activate a new sim online, if you still have a record of your old sim number. You can reach out to @FidoSolutions on twitter or Facebook or go to Fido.ca and do an online chat for assistance. I just updated my sim online in my account, I think my old sim number populated in the space automatically and then I entered the new sim number. The update is immediate. One of these methods will surely work for you
you can find the full instructions on how to update the SIM card here.