Because Apple aren't exactly the most open-minded company when it comes to letting you mess around with how your iPhone works, hacking one is pretty difficult.
Unless you set your sights a bit lower that is. If you just want to make your phone easier to use on long car journeys (hands free, of course), not tangle your headphones or build your own dock without spending a fortune, you can actually hack your phone with nothing more than cardboard and glue.
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Here's how: