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Choose General > Home to set preferences for double-clicking the Home button and searching categories on the Spotlight page. You can set iPhone so that double-clicking the Home button goes to the Home screen, Search, Phone Favorites, Camera, or iPod.

Set whether double-clicking the Home button shows iPod controls: 

Turn on iPod Controls to display iPod controls when you’re playing music and double-click the Home button. This feature works even when the display is turned off or iPhone is locked.

Set what categories appear in search results: 

Tap Search Results. All search categories in the list are selected by default. Tap an item to deselect it.

Set the order of search result categories: 

Tap Search Results, then drag next to a search category to a new place in the list.