Assuming you are not going to the poles you can use Inmarsat geopositioned satellites rather than
Iridium swarm satellites, which are a bit more expensive. The second question is your very temporary need, so you don't want a permanent
installation that would supply you more
service, but a a whopping cost. Check in with
https://www.satphonestore.com/tech-b...BoC1DsQAvD_BwE
and see if they have a portable unit that meets your minimum voice/text/email needs.