T-Mobile Investigating Claims of Customer Data Breach
vice.com
vice.com
Feb 2021: https://www.tomsguide.com/news/possible-t-mobile-data-breach
Dec 2020, March 2020, November 2019, August 2018: https://www.zdnet.com/article/t-mobile-discloses-its-fourth-...
Even if a class action suit occurs, they'll just settle it. To T-Mobile, that's just the cost of doing business.