> then perhaps the right pricing plan and offering for you is something like a guaranteed cell phone line, which comes with the promise that it will not be over-subscribed

Something like that does exist: https://en.wikipedia.org/wiki/Nationwide_Wireless_Priority_S... Mostly cops only. Fun fact: satellite phones had terrible reliability during Katrina, because so many FEMA people showed up and tried using them at the same time that they saturated the Iridium network.