Oncall support during outdoor activities

Hey Guys. I'm a system administrator that loves outdoor activities. Unfortunately these two aspects of my life seems to be in constant conflict as companies require me to be reachable most of the time. Specially I have some personal customers where I'm the only point of contact so suggesting having another person is not an option. I was wondering if you guys have experienced similar situations and find technology to sort this out. I've taken a look at the Iridium 9555 satellite phone but it looks big and unpractical. I'm obviously looking for options where mobile signal is not available. I couldn't find any SMS "receive only" satellite device though Thanks!

Juan