And I would say T-Mobile not only doesn't understand the threats after their many data breaches, they have continuously failed to improve Cybersecurity. They h

And I would say T-Mobile not only doesn't understand the threats after their many data breaches, they have continuously failed to improve Cybersecurity. They have an incredibly crusty, buggy billing system written in PowerBuilder, and I swear it's a holdover from the Voice stream days Disclaimer: Worked there in Tech Support.