In a significant development for commuters, the Berlin underground (U-Bahn) has finalized the installation of a 4G mobile network, ensuring high-speed internet access across its entire subway system. The initiative, a collaboration between Germany’s O2 Telefonica and Berliner Verkehrsbetriebe (BVG), marks a milestone achievement after years of planning and execution. Data usage among subway users has skyrocketed, increasing sevenfold since 2019, necessitating improved connectivity underground.