The Samsung Galaxy S4 is a high-end smartphone manufactured by Samsung Electronics. It was announced in New York City on March 14, 2013 as the successor to the Samsung Galaxy S III. The phone's software has many proprietary software features such as Air Gesture, Smart Stay, and Smart Scroll. Hardware features include a 13-megapixel back camera, and a 5-inch (130 mm) 1080p display. It i ..