>>388273
https:// www.google.co.uk/amp/s/www.deepdotweb.com/2017/07/21/researchers-crack-satellite-phone-encryption-with-new-attack/amp/
This article links Inmarsat, Iridium, Five Eyes and Snowdon.
I did some digging and found this too.
https:// www.prnewswire.com/news-releases/global-55-billion-satellite-telephones-market-forecast-and-opportunities-2021-featuring-globalstar-inmarsat-iridium-terrestar-and-thuraya—research-and-markets-300447838.html
It links to this, it seems to be behind a paywall though.
https:// www.researchandmarkets.com/research/k97p2k/global_satellite