Good morning, @tilley. Welcome to the Community, and thanks for reaching out.
No service pass is required for calling a number in Canada; that's natively included in your plan. A US/International service pass is used only for that - calling phone numbers that are from countries outside of Canada. Additionally, a US/Intl service pass will not interfere with your ability to place calls to other Canadian numbers.
Let us know if you have any further questions. Best wishes.
