T-Mobile Data Breach case is largest settlement in Missouri in 2023

The $500 million settlement with cellular provider T-Mobile, resolving a series of suits filed in the wake of a giant data breach in 2021, was the largest settlement case in the state of Missouri in 2023.

The agreement, which was reached last year, calls for T-Mobile to create a $350 million settlement fund and to spend $150 million upgrading its data security.

The breach occurred when cybercriminals stole the personally identifiable information of approximately 76.6 million current, former and prospective T-Mobile customers. The information included names, Social Security numbers, driver’s license numbers, phone numbers and the unique technical identifiers for customers’ phones.

Maureen Brady was co-lead council on the breach and was instrumental in the negotiations for this large settlement.

The value of the settlement is second only to the $1.5 billion settlement in 2019 involving a data breach of the credit bureau Equifax, which Siegel also led. According to Wimes’ order, the $350 million T-Mobile settlement fund provides twice as much recovery for the class on a per capita basis than the Equifax settlement did.