So far there are 2. The original and the 3G version.
The original iPhone is made of plastic while the 3G is made from metal. The original iPhone's battery was stated to be capable of providing up to seven hours of video, six hours of web browsing, eight hours of talk time, 24 hours of music or up to 250 hours on standby,
The 3G now has a SIM ejector tool, a Mini USB power adapter (North America) or Standard USB power adapter (Everywhere except North America).
Not really as there is differences in the operating software and different hardware on bother versions of the iPhone.
The latest iPhone is now available in 16, 32, and 64 gigabytes while all older iPhones have discount 8Gb versions only.
Four. Xbox, PC, iPod/iPad/iPhone and Android. There are three official versions, one Minecraft Pocket Edition, you can get it on Android and iPhone.
Yes. The iPhone 3G can run all iOS versions up to 4.2.1.
There is no 'iPad phone'. There is an iPhone. The iPhone sells for between free and $700, depending upon contracts and versions.
No. Only the new Macs and iOS versions are unveiled, You should hear about the iPhone 5 in the fall.
iPhone 4 models are sold in 8 GB, 16 GB, and 32 GB versions.
There are 2 versions: 16 Gb and 32 GB.
It is a new phone and an upgrade on exsisting previous versions.
As far as anyone knows, Apple will keep making new versions of the iPhone as long as people keep wanting them, some products that Apple has that will not have unlimited versions are probably the iPod shuffle and the iPod classic.
Apple Computer iPhone users are dedicated smartphone users. Many fans keep their older versions after the purchase of the latest version. These users sometimes even specialize the uses of their smartphones. E.G. one iPhone for work and another for personal business. There is nothing wrong with this practice. It is the users who buy the latest iPhone then place the earlier versions in the back of a desk drawer or filing cabinet that lose money on these phones. Smartphones depreciate quickly just as computers do. People should check their iPhone inventory with every upgrade and sell unused ones.
The official release only says Iphone handsets,I assume that means that they work on all versions of the phone.