T-Mobile has no data security. I ran into a security breach there once. I reported it. It didn't get taken seriously. I did access the bills of several random

T-Mobile has no data security. I ran into a security breach there once. I reported it. It didn't get taken seriously. I did access the bills of several random T-Mobile customers, by accident, through what appeared to be a half-dozen related gaping holes. On the other hand, they have super-friendly customer service and they don't cheat.