If we started with a very basic, touch tone phone and worked from there it might be doable. Seems to me the hard part is breaking through the FCC/Cell company monopoly, so just focusing on how to contact a cell tower and make a voice phone call would be the key.
That’s not untrue but phones are complex, requiring lots of components and drivers to work together, so it’s hard to get a fully free phone.
If we started with a very basic, touch tone phone and worked from there it might be doable. Seems to me the hard part is breaking through the FCC/Cell company monopoly, so just focusing on how to contact a cell tower and make a voice phone call would be the key.