There is no reason why they would necessarily need to charge such high monthly prices in poorer countries. If the marginal costs can be kept low enough then it

There is no reason why they would necessarily need to charge such high monthly prices in poorer countries. If the marginal costs can be kept low enough then it would be stupid to miss out on the revenue. A key to that is probably the inter satellite links to avoid needing so many base stations. Also, parts of Africa have pretty good cell coverage. So it may not be needed in a lot of areas.