How to create contacts in address book in iPhone SDK?
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ABRecordRef person = ABPersonCreate(); // create a person
NSString *phone = @"0123456789"; // the phone number to add
//Phone number is a list of phone number, so create a multivalue
ABMutableMultiValueRef phoneNumberMultiValue = ABMultiValueCreateMutable(kABMultiStringPropertyType);
ABMultiValueAddValueAndLabel(phoneNumberMultiValue, phone, kABPersonPhoneMobileLabel, NULL);
ABRecordSetValue(person, kABPersonFirstNameProperty, @"FirstName" , nil); // first name of the new person
ABRecordSetValue(person, kABPersonLastNameProperty, @"LastName", nil); // his last name
ABRecordSetValue(person, kABPersonPhoneProperty, phoneNumberMultiValue, &anError); // set the phone number property
ABAddressBookAddRecord(addressBook, person, nil); //add the new person to the record
ABRecordRef group = ABGroupCreate(); //create a group
ABRecordSetValue(group, kABGroupNameProperty,@"My Group", &error); // set group's name
ABGroupAddMember(group, person, &error); // add the person to the group
ABAddressBookAddRecord(addressBook, group, &error); // add the group
ABAddressBookSave(addressBook, nil); //save the record
CFRelease(person); // relase the ABRecordRef variable