As long as the M-Zone card is used for international calls, can I call foreigners and send messages?

Opening an international long distance does not necessarily have the function of international short message.

I don't know what M-Zone card is. Anyway, every time I go back to China, I change my domestic card, and once the card is opened for international calls, I can't send international short messages. If the international long-distance call function is enabled, the international long-distance call can be broadcast live.

Just make a phone call and ask, and telecommunications will do.