Related to accessing contacts (CRUD, operations on contacts like messaging) from contact-list or address book in mails, android, iphone, windows-phone or facebook.

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Every developer that has dealt with the AddressBook API in the past can definitely say that it wasn’t the most easy part of the iOS SDK to work with. In general, the AddressBook was difficult to understand and manage, and that fact was even more intense in new developers. All that belongs to history, as the new Contacts framework is way simpler to understand and use.