I guess if you're a terrestial teleco you have to do something to compete with Starlink, but I'm not sure I'd make the investment in these in rural areas if SpaceX can really make Starlink economical. But that's a big IF right now.
For example, urban homes and companies may want to chose them for any number of reasons and if they do, their willingness to pay may be higher than for rural folks and definitely higher than rural folks in Africa.
There probably is no market-based way to to do such a thing if there are global bidders for a resource unless there's some kind of non-market intervention such as Starlink setting aside a certain bandwidth per nation, or per economic tranche etc.
Novel solutions to the rural/distance problem are welcome. Even it's just literally 'a higher tower' as long as it works and is sustainable/cheap.
Also if you have to put up a pizza sized box outside your home, your landlord might complain. Even if you are the owner, building codes may prevent you.
BTW any internet provider could, they usually offer a SIP phone anyway. If this could be connected to a femto-cell coveting a household, this could solve the problem of using a phone around the house, in the backyard, etc.
Making it accept a SIM card from an existing provider is another problem.