I have started international roaming, but I still can't send short messages.

You can consider the following situations:

(1) Please check whether the settings of the SMS center are correct.

(2) When sending short messages to international, Hong Kong, Macao and Taiwan users, the sending method is 00+ opposite country code+opposite number or "+opposite country code plus opposite number".

(3) In some countries and regions, the network only supports "00" transmission mode.

If the above situation is ruled out, you still can't send text messages. Please call China Unicom's international roaming customer service hotline+8618618610010.