Apple is the world’s largest information technology company by revenue, and the world’s second-largest mobile phone manufacturer after Samsung .iPhone is a line of smartphones designed and marketed by Apple Inc. They run Apple’s iOS mobile operating system. The first generation iPhone was released on June 29, 2007, and there have been multiple new hardware iterations since.The user interface is built around the device’s multi-touch screen, including a virtual keyboard. The iPhone has Wi-Fi and can connect to cellular networks.Apple has released ten generations of iPhone models, each accompanied by one of the ten major releases of the iOS operating system. The original iPhone was described as “revolutionary” and a “game-changer” for the mobile phone industry. Newer iterations have also garnered praise, and the iPhone’s success has been credited with helping to make Apple one of the world’s most valuable publicly traded companies.