International Calling

I hope this is the right place to post. My husband's passport renewal finally went through and he's now eligible to drive into Canada. We are trying to figure out what the best option for a phone plan that includes international calling, would be. His company recommends Verizon for the best coverage but I'm wondering about Google Fi which doesn't run off Verizon at all, for a more cost effective option. Most of his data usage goes to Google Maps. He's not a web surfer or youtube watcher, anything like that. We live in Montana, which is also where his company is based, but he drives OTR, coast to coast...and potentially now Canada, so I do wonder about how the coverage would be here at home. My current MVNO plan runs off ATT and I seem to have slightly worse coverage, as we travel around SW Montana, than his current Verizon MVNO (which he is not satisfied with and would like to switch from in any case).

This is probably going to sound very stupid, but I honestly don't know. Google Fi charges 20 cents per minute for international calls. I presume that means when he's calling me or the office from Canada. Does that apply if I call him? I'm guessing it does.

The questions: Do you think Google Fi would have the coverage he needs at home and while driving and do you think it would be most cost effective? If not, what would you suggest instead?

Thanks!