Why can't the mobile phone receive the short message sent to China Unicom from the mobile phone number roaming to Hong Kong?

This may be a problem of interconnection, because Unicom 186 belongs to a new number segment, and some functions on the server are still not perfect. In addition, Hong Kong is an international roaming, and it is the connection between China Mobile and China Unicom, which requires multi-network conversion, so there may be problems. I suggest you ask your friend to send it to other Unicom numbers, and then feedback the results to Unicom customer service for processing after testing. .