I am amazed by where Outernet has already been able to go.
The old temporary Ku / C band Outernet service offered a $2 or $5 monthly fee to have your twitter messages “scrapped” and sent over the Outernet service.
Assuming a similar service is going to be offered again then remote users without internet could possibly have the following ways of sending a forward message and Outernet being the back or return channel. Currently any Amateur Radio (HAM) OUTNET APRS messages sent to the AMSAT Satellites or the International space station are being back channeled every hour on Outernet.
Ways to send remote messages for people who do not have Internet.
APRS vie HF Radio (2000km to 3000KM maybe) (free to HAM)
APRS Via Terrestrial VHF (40KM Maybe) (Free to HAM)
APRS VHF or HF Satellite ISS (Overhead several times a day)Free to HAM)
PSKMAIL HF Radio Messaging / Internet. Some worldwide stations. 2000 to 3000km (Free to HAM)
WInlink Winmor HF Radio 1000 - 2000km Free to HAM)
Winlink Pactor HF Radio 2000-3000km (Free to HAM)
SAILMAIL. Marine 150 W HF Radio 2000 to 3000Km $250 a year.
Iridium Go Messaging service. 2.4k (slowwwww)Satellites Overhead all the time. approx $20 to $125 month for unlimited.
Sat Phone companies have some messaging capability but expensive.