What is the transmission of International Short Message Unicom?

The methods of sending international short messages are as follows:

1. If you send short messages to Taiwan, Hong Kong, Macao and other countries or regions except Chinese mainland during domestic or international roaming, the sending format is: + country code+other party number;

2. If you send a short message to Chinese mainland during international roaming, you can directly enter the other party's number in the sending format.