With all all the reductions in promotions, offshoring, and nickel and diming customers, is T-Mobile investing in their actual network any longer?

They used to brag about network upgrades and spectrum aquistions all the time. For instance, there was a constant stream of tower work in my area for many years, you could look up all the permits they were pulling for new towers and upgrades, it was a pretty good and consistent volume, but for over a year now that seems to have gone stagnant and the network is just getting slower with many unresolved dead zones. What are they doing with all their newfound revenue through cost cutting? Or maybe it's just my area they stopped improving.