T-Mobile is the #1 I have seen people switch to then bitch about or have issues with.This sums up the issue. It’s about priority on the towers. I am on uscellular as they offer the best coverage at home (rural Iowa), but when traveling the priority is lower and I can have 5g with 3-4 bars and not be able to get any data. Hopefully that will change now that T-Mobile bought them.