Perhaps when you think of satellite phones images of Jack Bauer from 24 flash into your head. In fantasy land satellite phones are these go-anywhere tools that allow you to walk around, talking to anyone, generally the President, and always about important things.
The reality is that satellite phones are expensive, fastidious, and at their best provide the audio quality of a mid 1990's cell phone operated from inside a cave. The remote antenna, the little black hockey puck looking thing on the ledge above my backpack, needs a fully unobstructed view of the sky. Obstructed, even with a tree's thin leaves and certainly with a roof will provide either no signal or continual dropped calls.
The only place I've been able to find that works is on the roof of a two story building near where we're staying. In the sun, on the roof, with clouds of mosquitoes. Jack Bauer never had to put up with this shit.
However if you need to talk to people worldwide where there is no cellular coverage (which generally implies no wifi coverage), you have no choice but a satellite phone. I use an Iridium 9555, which is sort of the workhorse model with a long history of performance. Not all satellite phone constellations are truly global, but Iridium is. My plan is $100/month which includes 70-140 minutes, depending on how the call is connected. In general it's reasonable to assume that airtime is $2/minute, and any outbound SMS messages (which allows us to update Twitter) is $1.
Beyond all that, I have a subscription to UUPlus. For another $30/month I manage to have the majority of my work email forwarded, compressed, and available via the incredibly bad 2.6KB/s data connection (with multisecond latency). Likewise, I can reply and unless you inspect the email header it will look like it came from my Outlook client on the corporate network.
And with UUPlus, I can download NOAA weather fax forecasts to see just exactly how screwed we are.
If you've never tried to do your job in a place that sans electricity, sans cell coverage, and even sans people, this might not really resonate with you. But for those misguided souls that are trying to bridge the chasm between first world professionalism and the third world, this blog post is for you bros.