Best example of how to add entry to contacts using AddressBookUI framework on iPhone SDK

#pragma mark Adding person to the contacts

- (void)addContact {
    // Creating new entry
    ABAddressBookRef addressBook = ABAddressBookCreate();
    ABRecordRef person = ABPersonCreate();
    
    // Setting basic properties
    ABRecordSetValue(person, kABPersonFirstNameProperty, @"Ondrej" , nil);
    ABRecordSetValue(person, kABPersonLastNameProperty, @"Rafaj", nil);
    ABRecordSetValue(person, kABPersonJobTitleProperty, @"Tech. director", nil);
    ABRecordSetValue(person, kABPersonDepartmentProperty, @"iPhone development department", nil);
    ABRecordSetValue(person, kABPersonOrganizationProperty, @"Fuerte international", nil);
    ABRecordSetValue(person, kABPersonNoteProperty, @"The best iPhone development studio in the UK :)", nil);
    
    // Adding phone numbers
    ABMutableMultiValueRef phoneNumberMultiValue = ABMultiValueCreateMutable(kABMultiStringPropertyType);
    ABMultiValueAddValueAndLabel(phoneNumberMultiValue, @"07972574949", (CFStringRef)@"iPhone", NULL);
    ABMultiValueAddValueAndLabel(phoneNumberMultiValue, @"01234567890", (CFStringRef)@"Work", NULL);
    ABMultiValueAddValueAndLabel(phoneNumberMultiValue, @"08701234567", (CFStringRef)@"0870", NULL);
    ABRecordSetValue(person, kABPersonPhoneProperty, phoneNumberMultiValue, nil);
    CFRelease(phoneNumberMultiValue);
    
    // Adding url
    ABMutableMultiValueRef urlMultiValue = ABMultiValueCreateMutable(kABMultiStringPropertyType);
    ABMultiValueAddValueAndLabel(urlMultiValue, @"http://www.fuerteint.com", kABPersonHomePageLabel, NULL);
    ABRecordSetValue(person, kABPersonURLProperty, urlMultiValue, nil);
    CFRelease(urlMultiValue);
    
    // Adding emails
    ABMutableMultiValueRef emailMultiValue = ABMultiValueCreateMutable(kABMultiStringPropertyType);
    ABMultiValueAddValueAndLabel(emailMultiValue, @"info@fuerteint.com", (CFStringRef)@"Global", NULL);
    ABMultiValueAddValueAndLabel(emailMultiValue, @"ondrej.rafaj@fuerteint.com", (CFStringRef)@"Work", NULL);
    ABRecordSetValue(person, kABPersonURLProperty, emailMultiValue, nil);
    CFRelease(emailMultiValue);
    
    // Adding address
    ABMutableMultiValueRef addressMultipleValue = ABMultiValueCreateMutable(kABMultiDictionaryPropertyType);
    NSMutableDictionary *addressDictionary = [[NSMutableDictionary alloc] init];
    [addressDictionary setObject:@"8-15 Dereham Place" forKey:(NSString *)kABPersonAddressStreetKey];
    [addressDictionary setObject:@"London" forKey:(NSString *)kABPersonAddressCityKey];
    [addressDictionary setObject:@"EC2A 3HJ" forKey:(NSString *)kABPersonAddressZIPKey];
    [addressDictionary setObject:@"United Kingdom" forKey:(NSString *)kABPersonAddressCountryKey];
    [addressDictionary setObject:@"gb" forKey:(NSString *)kABPersonAddressCountryCodeKey];
    ABMultiValueAddValueAndLabel(addressMultipleValue, addressDictionary, kABHomeLabel, NULL);
    [addressDictionary release];
    ABRecordSetValue(person, kABPersonAddressProperty, addressMultipleValue, nil);
    CFRelease(addressMultipleValue);
    
    // Adding person to the address book
    ABAddressBookAddRecord(addressBook, person, nil);
    CFRelease(addressBook);
    
    // Creating view controller for a new contact
    ABNewPersonViewController *c = [[ABNewPersonViewController alloc] init];
    [c setNewPersonViewDelegate:self];
    [c setDisplayedPerson:person];
    CFRelease(person);
    [self.navigationController pushViewController:c animated:YES];
    [c release];
}

If user wants to save the contact the "person" variable is not nil

#pragma mark Adress book delegate methods

- (void)newPersonViewController:(ABNewPersonViewController *)newPersonView didCompleteWithNewPerson:(ABRecordRef)person {
    if (person) {
        ABAddressBookRef addressBook = ABAddressBookCreate();
        ABAddressBookAddRecord(addressBook, person, nil);
        ABAddressBookSave(addressBook, nil);
        CFRelease(addressBook);
    }
    [self.navigationController popViewControllerAnimated:YES];
}