Editing all entries in the iPhone phonebook

I have an idea and I want to know if it would be possible to implement on iPhone or not. Basically I want to access every entry on the iPhone phonebook, add a prefix before all numbers a开发者_StackOverflow社区nd then save it again, all without the asking the user to press save on every entry.

Is that possible?

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Yes, that's possible. Read Address Book Programming guide.