I think that I lived with the horrific, byzantine, and abusive billing at AT&T for so long that I am in complete shock now that I'm with the no-nonsense billing at T-Mobile. It's just a text once a month saying "Your bill is $50. Period. And we've paid it from your credit card. Your balance is now $0. Have a great day." Or something like that.
My God. When I think back to the MONTHS I spent just trying to just pay the for the damn plan that I purchased with AT&T... but could never get straightened out... it's nigh-traumatic. Every month the amount was wrong. Then I'd end up having to call, then end up with a credit, then I'd get some mysterious charge nobody could explain, then my credit would disappear, then the amount would change, then they'd want me to switch plans to fix it(!), then they would say it was fixed but it was never fixed, then they would pro-rate a correction to the correction of the correction. And it was still wrong. HOURS of my life gone... and for what? Having to do it all over again the next month!
So relieved those days are over!