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The ultimate Apple iPhone user guide

everything you need to know to use an iPhone.

Here's everything you need to know to get started with a new iPhone.

Audio jack

The tour continues with the top-left corner of the iPhone. Here's where you plug in the white earbuds that came with your iPhone.

This little recessed hole is no ordinary 3.5mm audio jack, however. It contains a secret fourth pin that conducts sound into the phone from the microphone on the earbuds cord. Now you, too, can be one of those executives who walk down the street barking orders to nobody in particular.

The iPhone can stay in your pocket as you walk or drive. You hear the other person through your earbuds, and the mic on the cord picks up your voice.

Incidentally, the tiny microphone nodule on the cord is more than a microphone; it's also an Answer/Hang Up clicker.

Tip: In theory, you can use any standard headphones with the iPhone — a welcome bit of news for audiophiles who don't think the included earbuds do their music justice. The catch, however, is that the molding around the iPhone's audio jack prevents most miniplugs from going all the way in. You may be able to get your headphones to fit by trimming its own plastic collar with a razor blade — or you can spend £7.99 for a headphone adaptor (from Belkin.com/uk, among others) to get around this problem.

This article is extracted from David Pogue's 'iPhone UK The Missing Manual' (OReilly 2007).

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