What is the aux button on the ford fusion 2006 for?

Just got a ford fusion and it has an aux button for nothing to plug your phone in. Is it secretly somewhere? Do you sync your phone (I have an iphone 5). Or is this button just for show?

Read the owners manual

When you connect a music player you push the aux button and it switches from radio to music player

On some vehicles there's an aux or USB port in either the glove compartment or center console.

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