docs: public ListPhoneNumbersOptedOutResult withPhoneNumbers(String... phoneNumbers) {
          if (this.phoneNumbers == null) {
              setPhoneNumbers(new com.amazonaws.internal.SdkInternalList<String>(phoneNumbers.length));
          }
          for (String ele : phoneNumbers) {
              this.phoneNumbers.add(ele);
          }
          return this;
      }