how the iphone phonebook operation?

As the title, I want to achieve hidden phonebook function, which experts can give pointers?
Thank you!
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To pick points ~ ~ ~
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Oh, now no one has discussed the development of the iPhone, presumably because the environment is more difficult to build
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'd Build a good environment, that is, the method hard to find ah. Can not find the corresponding api function, people want to cry ~ ~ ~ ~ ~ ~


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Here is deserted! . . Drifting ~
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Hear about the use of database operations can be.