Management of the Group

Transition to postpaid accounts in the United States operating segment. Beginning with the first quarter of 2026, our United States operating segment (T‑Mobile US) reporting will transition from total number of postpaid and prepaid customers to total number of postpaid accounts. From T‑Mobile US’ perspective, this transition aligns to its long-held priority on growing high-value accounts, which they believe is the best reflection of value creation versus customers. Prior to the transition, as of December 31, 2025, our United States operating segment reporting included 142.4 million total postpaid and prepaid customers instead of 34.2 million postpaid accounts.

A postpaid account is generally defined as a billing account that generates revenue. Postpaid accounts generally consist of customers that are qualified for postpaid service utilizing phones, 5G broadband gateways, fiber connections, mobile internet devices (including tablets and hotspots), wearables, DIGITS and other connected devices (including SyncUP and IoT), where they generally pay after receiving service.

The reporting of our other operating segments remains unaffected by this. In the Germany and Europe operating segments, we continue to report customer numbers for mobile communications, fixed network, and broadband.

Change to the definition of service revenue. Our service revenues essentially comprise predictable and/or recurring revenues from Deutsche Telekom’s core activities. Since January 1, 2026, certain wholesale voice transit revenues have no longer been included in service revenues due to their unpredictable or non-recurring nature. Prior-year comparatives in both of the affected segments, Germany and Europe, were adjusted retrospectively.