International Calling from Canada

I’m trying to find out what, if anything I need to do when traveling to Canada so that I can use my Xfinity mobile phone.  I gotten 3 different answers from Xfinity.

1.  I tried online help and then got somebody to call.  They said I needed to get a Mobile Travel Pass and it would be $10 / month.

2.  At the store he said I didn’t have to do anything, except maybe turn phone off and get it on new network.

3.  I called 1-800-XFINITY and he said I needed to get a Global Travel Pass which costs $5 / day.

I think #3 is correct, but don’t feel confident, since Xfinity support people can’t agree.  Not sure if I’ll have a phone to use in Canada or not.  Any suggestions?