So I am originally from Canada living in the UK. I had a plan with Koodo, iPhone 7. Pretty sure my plan is over now, as of about last month. Anyways, I am traveling to Canada for a week this Saturday (May 13) and I want to be able to use my phone while I'm there. Can I buy a prepaid plan and link it to my old SIM or do I need to go out and buy a new SIM altogether?