Apple's first generation mobile is the iPhone 2 for its 2G connectivity, rather than the more common 3G. Apple's second-generation iPhone was actually the iPhone 3G, named for the protocol it supports, even though many people may think it means third generation.
Despite its relatively low connection speeds, the iPhone 2, or 2G, not only works as a mobile, but also makes a useful portable media player. It is even user serviceable to a degree, as anyone with some patience and the right tools can replace the screen if necessary. Cases and other accessories are still available for anyone who wants to use one as a mobile, or just pass it to a child as a media player.