Design & Display: Large, curved, edge-to-edge Retina display with narrow bezels offered a significant visual improvement and more info at a glance.
Performance: The S4 chip made it very fast for apps and daily tasks, a huge leap from older models.
Health Features: Introduced ECG (Electrocardiogram) and advanced fall detection, making it great for health monitoring, especially for older users.
Fitness Tracking: Excellent accuracy for heart rate, GPS, and workouts, allowing phone-free exercise.
Functionality: Seamless for notifications, calls, Apple Pay, and Siri.