Hmm
I was under the impression that Apple already had something similar _operational_. https://www.apple.com/newsroom/2022/11/emergency-sos-via-satellite-available-today-on-iphone-14-lineup/
Satellite messaging via mobile phone appears to be the in-thing at this year's CES show in Las Vegas, with the launch of two services from comms chipmaker Qualcomm and UK-based smartphone company Bullitt Group. Qualcomm's Snapdragon Satellite offering is set to offer two-way messaging for smartphones based on its Snapdragon 8 …
So 95% of the Android market will be cut off from it. Either Iridium doesn't have the capacity to handle the load if Qualcomm included this in more mainstream offerings, or they want it to remain a premium offering. i.e. if it is restricted to only high end Android devices, maybe they get sold the ability to send non-emergency text messages at premium prices since they know everyone with the satellite capability has money to spend.
"These subscription costs are below Garmin Inreach or Spot. But I suppose the crowds for those won't switch to fragile smartphones"
The problem with a subscription for this sort of thing is that it's a service only for emergencies. I cant imagine many average people (obvious edge cases such as explorers and remote populations excepted) paying £/€/$60/year for the ability to send a 999/112 text, just in case they have the extremly rare event of an accident and no coverage from any network. Then for those that don't, there's the possibility of bad publicity when it turns out your brand of phone didn't allow emergency access when it could have done. I'm not sure that's even legal.
Frankly they'd probably make more money by charging several £/$/€ per message and allowing texts to anyone. At least then many users would spend some money once in a while just to see if it works.
Though I suspect they technically can't, as the return channel for any replies would be just as expensive.