***Update*** Adding Canadian service to Verizon plan

I added Global Roaming on my cell phone which included Canada with no problems. We used it in Banff and Lake Louise area with no problems. When I returned to the US, Verion cancelled Global Roaming and prorated the last month.
I also added data to my Verizon Mi-Fi for my laptop. You buy it in packages. I think it was $25 for each 100MB. When you go over 100MB, they bill you another $25 for another 100MB.