Luckily it's not all wasted effort. The different networks boil down to implementing a very simple FDMA scheme. Each telco gets their own frequency, and custome

Luckily it's not all wasted effort. The different networks boil down to implementing a very simple FDMA scheme. Each telco gets their own frequency, and customers of different telcos never interfere with eachother. I hope/imagine that a lot of fiber backhaul is shared between operators that share towers.