Data Privacy Keeping Our Customer Data Safe and Secure We love our customers. Earning and keeping their trust by respecting and protecting their data is central to how we operate. This is vital to our business, and it’s the right thing to do for our customers. Early in 2021, we launched an updated Privacy Center to give customers a clear and simple explanation of how their data is used and how they can manage it. There, customers can find the T-Mobile Privacy Notice, Children’s Privacy Notice, and other important privacy information, including educational content for consumers on how to better protect themselves and their data. This is how we help cut through the complexity of data privacy and security for our customers and make it easy to learn about the information we collect, how we use it, and the measures in place to protect it. Our Pillars of Privacy At T-Mobile, data privacy is built around five principles: trust, transparency, control, education, and protection. Together these principles drive what privacy looks like across our company. Tr u s t We value the privacy of the data that is entrusted to us. We believe that every customer deserves core privacy protection practices and to only have their data used for legitimate business purposes. That includes not using it to send unwanted marketing communications and preventing harmful biases in our algorithms. Transparency We’re open and honest about our privacy practices and the way we process personal data. We inform customers of important updates to our Privacy Notice and how they can exercise privacy choices and set preferences by using simple, clear language and easy-to-find information. Our annual Transparency Report provides additional information and data on how we deal with law enforcement and national security requests for customer data. Control We put our customers in control when it comes to their data and their preferences. With simple, clear data choices, customers can easily access and delete their data and set marketing preferences. We offer all U.S. customers choices to opt out of targeted advertising, even in states where it’s not legally required. Our Customer Care teams are equipped to assist customers with questions about the data controls available. Education We help customers understand privacy and data use so they can make the right choices. One way we do this is by providing educational resources and video guides for customers on a range of topics across data transparency, data-sharing, and marketing choices, and security and controls for the whole family. Protection T-Mobile works to protect the customer data we collect. For products that use personal data, it’s our policy to collect only what’s necessary, retain it as outlined in our retention policy, and delete it after use. We work with our suppliers and partners so that they are also applying reasonable safeguards. T-Mobile was the first U.S. wireless provider to implement number verification in 2019. We also led the industry in 2020 in implementing STIR/ SHAKEN with all major U.S. network providers to fight number spoofing and further protect customers from scammers and unwanted robocalls. Scam Shield™ adds further protections from spammers and scammers. For more details, see the Cybersecurity section. 2021 CORPORATE RESPONSIBILITY REPORT OUR PEOPLE OUR COMMUNITIES THE NUMBERS AND SMALL PRINT 20 OUR COMPANY THE ENVIRONMENT OUR GOVERNANCE