The "Defense Secure Mobile Phones Act of 2025" directs the Department of Defense to provide secure mobile phones to senior officials and employees performing sensitive national security functions within 90 days of its enactment. These phones and their related telecommunications services must be acquired under contracts requiring enhanced cybersecurity protections. These protections specifically include data encryption , capabilities to mitigate or obfuscate persistent device identifiers through periodic rotation, and the ability for continuous monitoring to enhance security and prevent tracking. Finally, the Secretary of Defense must submit a report to congressional defense committees within 180 days, detailing implementation contracts, criteria for sensitive personnel, the number of such employees, and total costs.