Wow. T-Mobile finally got rid of their popover dialog that informed me they have a new mobile website. I don't know if it was a bug or what but that thing appeared, and I had to dismiss it, every time I logged in for the last, oh, 5 years or so. It wasn't even a call to action, just a "hey we have a new website, ok bye" type message!
@darius Two days later the website starts showing a popup saying "Our mobile website is very old"