Who can tell me how to send international short messages?

There is no need for international roaming, just add the code of his country before his mobile phone number. For example, the country code of China is 86, so if you look at our mobile phone messages, there is always +86 in front.

The country code of France is 33. So 33+ his mobile phone number will do. It seems that the tariff is expensive. To Hongkong \ Taiwan Province Province is one yuan, which should be about the same.