I’m currently posting from Svalbard, as close as you can fly commercially (and more importantly with miles) to the North Pole. My Project Fi phone has perfect 4G LTE service, even in this isolated region of the planet.
I bought a Project Fi compatible phone a couple months ago with this trip in mind. There was no credit check to start service. I was able to pause service until the start of the trip for free. You can pause service for up to 3 months at a time with no limit on extending the service pause. When you do activate the service the cost is $20 per month for unlimited calling and texting. Data is $10 per GB and if you only use 100MB for example you’ll only be charged $1.
International data is charged at the same rate as in the US. International texting is free. International phone calls are 20 cents/minute.
Verizon won’t let me activate their TravelPass plan as I have grandfathered unlimited data, but Project Fi has been a better deal anyway!