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That's a very obscure question. HP pages generally don't mention this sort of issue with dialing.
It seems that instead of +, you dial 011, which is an 'exit code', meaning international calling. You follow this with the country code, etc.
If you are trying to call an exotic locale, such as Azerbaijan or similarly trans-east-European locales, this may not work properly. Let me know the result you get, please, and I will advise further as needed.