Smartphones have radically changed medicine by giving doctors access to medical information, records, and colleagues from any location. Apps allow remote monitoring of patients and diagnostics like ECG readings. As sensors and artificial intelligence improve, smartphones will take on more medical roles like monitoring organs and managing chronic conditions. While technology expands access to care, doctors will still be needed for human touch, guidance, and complex treatments. Overall, smartphones are transforming healthcare by connecting doctors, patients, and data in new ways.