I've used this in places with zero cell service. It doesn't take long to turn on and send a message, maybe 5 minutes at most. You can send messages through device itself, but using the app makes it a lot easier. It's easy to use, if you don't like reading directions.
Been using the inreach for 6 months now. It helps the Mrs. feel more comfortable while I am in the backcountry. I like that I can send prebuilt messages along the way at no extra cost to let her know how the trip is going.
Planning on using it hunting and for 14ers so far have not tested it to much but I love the size and in app features seems easy to call sos and send messages throw your phone wish it was a tad bit smaller personal but I've been running/ backing for a while and I'm a ultra light guy so for most people this would be great size just buy one I wanted to long sos is a important thing if your in the back country a lot
I hike alone sometimes there is no cell service I'm able to keep in touch with my family now. I notice a lot of hikers are Also using the garmin devices. Simple easy to use.
After setting up the account I was able to text seamlessly with others using inReach to coordinate and update while deep in the wilderness far from cell service. Using the phone I already have with me is a big bonus with this unit.