You guys considering tmobile do research but here's my experiance. If I have cell signal things work as expected as I leave signal (I use it daily in GYE) I lose all signal for about a minute then I get a notification I have switched to sat and are limited in service. While I am in sat I can only use data on a handful of apps onx, Google messenger and accuweather all work fine (there's a list) i can make phone calls on What's App or use it a a text service. My wife sees me whole time on Google maps while I am using device since I have Google sharing turned on with her. It does draw little more battery and forces gps on to aquire sats. While clear line to sky helps I get texts and calls within my pocket all day. I havnt experianced any outages or issues yet other than some sluggishness when in transition or sending numerous pics. Sending pics, texting, getting real weather forecast and talking to wife in backcountry is pretty nice and honestly I can't believe not more people have jumped on yet. Hope this review helps, swapping after 21 years from Verizon was best choice I have made in long time.
Also I have a inreach mini for sale, pm me