I had ATT for almost 20 years. Switched to T-Mobile in 2020. No complaints at all. I like it far more than ATT. M

T-Mobile premium plan should have unlimited hotspot or you can add it for cheap. Check I remember thinking about it but ultimately decided not to get it.

I frequent Passaic/Essex/Bergen/Hudson counties but I do travel up and down tri-state area. In general no issues at all.

For some reason I can't get service in Costco stores no matter where they are.