Six.
iPhone - The first iPhone Apple created.
iPhone 3G - The second iPhone, improved size and look.
iPhone 3G S - The third iPhone, introduced video camera.
iPhone 4 - The fourth iPhone, slimmer, introduced video calls (FaceTime), folders, multi tasking and other features.
iPhone 4S - an improved iPhone 4 with new features, such as personal assistant, Siri and a better camera.
iPhone 5 - a thinner, taller iPhone with better cameras and includes the new lightning charger.
The latest iPhone is now available in 16, 32, and 64 gigabytes while all older iPhones have discount 8Gb versions only.
Yes, it's also available for the iOS versions like the iPad and iPhones, etc.
There are many stores that sell new iPhones. Many AT&T stores have a wide selection of iPhones to choose from, as well as Apple stores. They can also be found at Walmart.
There was about 1.37 Million iphones sold in 2007
You can carry as many iPhones as you want to India for personal use, as long as they are declared at customs and not intended for resale.
6
69
You can communicate with other iTouches and iPhones with facetime (on more recent versions at least...), however it lacks traditional calling mechanisms.
iPhones
Approximately 10 million
12.5
i think its 6