Thanks for the replies, very informative.
If I understand right, that means that there's still some spectrum that's unused but poorly distributed, and that there's still room for further optimizations to mobile network infrastructure. How soon do you think we'll reach a point where neither...
This question might be better answered by someone in the mobile industry, but I guess I'll ask it here since it does involve physics.
I understand that wireless spectrum for mobile data is finite, and will run out at some point. Out of curiosity, what are the implications of that exactly...