gistfile1.txt

ABAddressBookRef addressBook = ABAddressBookCreate(); // create address book record
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(kABPersonPhoneProperty);
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