i like the iphone,  designed and marketed by Apple Inc.
Apple is one of the leading branding companies in the world. 
Yeah iphone use Apple's iOS mobile operating system.
In the simplest terms, an operating system is what lies between you and the physical device
if i recall The first-generation iPhone was released on June 29, 2007
First announced Jan. 9, 2007, by Steve Jobs, the iPhone
Yeah i love them, The user interface is built around the device's multi-touch screen
One of the biggest advantages projected capacitive touchscreen technology has over other touch technologies 
i think even the first gen  has Wi-Fi and can connect to cellular networks.
Called MeshMe, the app allows you to chat with several people at a time while your phone