Because you didn't buy the right $50 dongle from Apple that allows you to do so? - COMPLICATED MR. NOODLE

Of course :-/ Well, if I get one specifically for the iPad I'll be really pissed if it doesn't work with the iPhone 4. - Kelly W.

And welcome to the wonderful world of gadgets. It used to be that when you bought a new gadget, it came with everything you needed to make it work. Now, you just get the gadget and then get nickle-and-dimed (well, $50 and $100) to death trying to get the various accessories you need for the darn things. - COMPLICATED MR. NOODLE