Satellite Phone/Hotspot

It sounds like the OP has plans to travel to places where cell service would be unavailable so Verizon or any other cellular service would be of no help.
Check out this site, MobilSat, https://www.mobilsat.com/ and see if there is something that will work for you. If you don't see it on the site, give them a call as they have a number of solutions to meet most satellite needs.

Check out Verizon's prepay unlimited data hotspot plan. Don't ask any of the Verizon store people about it because it is a prepay plan and the retail outlets don't have a clue about it. You can get details on Verizon's web site however. I have this plan with a Jetpack 8800L and it works great and is truly unlimited data. It is network managed, but not throttled and I have seen very few issues with the managed part. Watched two movies last night.

Take a look at the Spot satellite messengers. Various devices with different capabilities. Some you can type messages on the device, others you can configure canned messages that include your location. Does require a subscription but they now have month to month plans so you don’t have to keep it active when not in use. According to their website, a clear view of the sky is required for a signal. I have not used one personally, but an avid overnight hiker I know uses it all the time. Even in areas like the white Mountains in NH. Just know that under thick tree canopy the signal will likely drop out.