There's no doubt of the impact that the iPhone revolutionized the smartphone industry. I bought an iPhone for my daughter but the big screen and seamless Google integration of the Thunderbolt (Android) was just too much to pass up so I didn't go that direction. My daughter absolutely loves her iPhone, though, and literally can't go anywhere without it. An infographic from PaidViewpoint.com provides some insight into iPhone users, how they use the device, what their retention is like, and why they'll upgrade. The jury is still out on the iPhone 4S and whether it meets the demands of Apple fans. UPDATE: Sales have already exceeded 1 million phones so I guess it is!