The iPhone comes bundled with a standard set of iPod earbuds, but there are two differences from the kind that comes with your regular old iPod. First, these earbuds don't have the small plastic cable separator slide that helps keep your cables from getting tangled. Second, on the right channel cable about halfway up you'll find a very slim, discreet mic / music toggle. When listening to music, click it once to pause, or twice to skip tracks; when a call comes through, click it once to pick up, and again to hang up.
That same in-line piece also picks up your voice for the call, and it sounds pretty good -- some people on the other end of the line said it sounds even better than the iPhone's integrated mic. For those worried that there would be issues with interference, put your mind at ease. We heard absolutely no cell radio interference over the headset, even when we wrapped it four times around the iPhone antenna, and sandwiched it between a second cellphone making a call. The headphones are an essential and amazing accessory that makes the seamless media and phone experiences of the device possible. We only wish Apple managed to integrate an inline volume switch in there too, since that's really the only essential control it lacks.
Unfortunately for us, iPod headphones just don't fit our ears, so no matter how good they may sound, they're unusable since we can't seem keep them in longer than 30 seconds. (We typically prefer canalphones, they can't really go anywhere.) Since the included headphones are the only ones on the market right now that can interact with the iPod function, have an inline mic, and, of course, listen to audio, you're kind of stuck with Apple's buds if you want to get the most out of your iPhone. The same also applies to the expensive phones you invested in, which probably won't fit in the recessed jack anyway: even if you get an adapter, you still won't get the full experience.
Apple's included headphones are about 42-inches long (3.5 feet), just about the perfect length to reach from your pocket to your head with a little extra slack. You'd be surprised how many cellphone manufacturers screw this up with bundled headphones that are way too long, or way too short.
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