Well I don't have an iPhone but I have an Ipod touch (I'm typing on it now) andthere are a number of similarities. The battery recharges (fairly fast on the touch) but the battery has to be replaced at a service center (apple store, maybe Best buy). It can't run simultaneous apps. It can store full length
movies, it's all a matter of how much hard drive space you have. I have a 64 gig so I can store a good 10 movies . The app store on Itunes has about 800 trillion apps, basically there's an app for everything. Lots of games that don't suck too, many are free or have a free version.

Basically my understanding of the iPhone is it's an iPod touch with phone, texting, and 3g mobile Internet.