I agree with
@buck wild, I use WhatsApp for texting, picture and video exchanging with the home front and the PH, location sharing, sending voice messages and doing phone calls, with or without good quality video…
To my experience most PH’s and people in general in Africa are only reachable via WhatsApp anyway.
To the OP, in SA you should have 4G almost anywhere. In the wilder places of Africa, unless you see a need to be reachable during the hunting hours, while tracking and stalking, there is no real need for a sat phone, as most camps will have WiFi. I see a need for a sat phone only if you truly go away from civilisation. There are such places still in Africa, but not in SA I believe.