Can I send and receive text messages without roaming in the M-Zone?

The M-Zone card itself can roam all over the country, including Hong Kong and Macau. In China, you only roam by phone, not by SMS. No matter where you go, it's the same as when you are in the local area, except that you have to pay extra for leaving the country, and the cost is not low. However, you don't have to worry, M-Zone SMS is monthly. Sending messages anywhere in China can only deduct the number of short messages, and the reception is normal.