Another satellite option is SatPaq
I just found their site; don't know anything about them other than what I read on their faq.
For emergency use only, I belive that a call placed to 9-1-1 will go through the tower system of any cellular company in range, with or without an active account.You might want to check out the different cell carriers for the region your looking to be in. Maybe or not, there just might be another cell carrier that may have some coverage where your looking to be in. Don't go by any coverage map they provide, because most of them are bogus anyway.
I have worked for many different cellular companies since 1991. Have used just about every carrier out there over the years. What I have found during traveling around a bunch is that Verizon and AT&T would be my choice of carriers. Sprint seems to brag about their coverage, but in using their phone, their coverage did not impress me at all outside any major city or high house concentration areas or along large Interstate highways.
Jim
For emergency use only, I belive that a call placed to 9-1-1 will go through the tower system of any cellular company in range, with or without an active account.
I have the inreach mini with text messaging. We spend a lot of time without cell coverage in Eastern Oregon. The mini works great. I have reached some repeaters with my HT but not much going on or people just don't want to respond.
To the OP, as noted in this post and others, Iridium is the solution I would first try before relying on any amateur repeaters, or simplex. I like the mini due to its size, but the Garmin inReach SE+ has double the battery life of the mini and the SE+ is $290 on Amazon. That is just the device though. You can get annual or monthly service subscriptions you can turn off / on as needed. What is also convenient is the ability to send and receive text messages for non-emergency situations. A particular number of text messages are included and you pay for extra, or unlimited depending on the plan. (That's per text message whether sent or received) See the bottom of this page for plan details. Satellite Communication Devices | inReach® by GARMIN
The Garmin inReach SE+ and the Garmin mini are not Iridium phones. They send short messages and should work for what the OP posted regarding their respective needs.