"nearly all of which is the type widely available in marketing databases or directories."
"Your personal info is already out there, everywhere, anyway. Thanks to companies like T-Mobile US, of course."
And that's not only because of their lax security, but also because of their lax privacy ethics.
A little while ago while trying to cut my TV cable, the cable lady tried to peddle me their brand new phone service. I engaged her a little just to make sure that the connection stayed on until she finished her side of the deal, and I told her that I had tmobile and wasn't interested on the cable co cell service. That's when she slipped on an argument and mentioned the exact number of years I had been with tmobile. I stopped and asked her how she knew that, since I wasn't even sure how many years I had been with them, and for sure didn't inform her that. The selling push died right after that and I got my TV service disconnected.
Now, how did they know? So either the largest cable company in the us bought one of the previous tmobile exploits from some dark figure or... tmobile sold them my information! Probably before they realized that the tv cable company was coming after tmobile's customers.
So effu tmobile for all your shitty security. The last class action lawsuit is not even completely baked yet, and you're already mixing the ingredients for the next one. I think the punitive damages should go up exponentially this time, because clearly you didn't care enough the last time around.