That was T-Mobile Austria and at the time T-Mobile USA (and iirc a couple other T-Mobile subsidiaries) said they used a different customer account system than T

That was T-Mobile Austria and at the time T-Mobile USA (and iirc a couple other T-Mobile subsidiaries) said they used a different customer account system than T-Mobile Austria and handle account passwords differently. (T-Mobile Austria has since figured out that storing this is a bad idea and promised to change how they do it. Dunno what they have done as I'm not a customer of them nor live in Austria, I just remember the the shitstorm on twitter about it.)