What software can I use on my computer to send text messages to Vietnamese mobile phones?

Uh. . . This question. . . . Yes, there is, but if it is free, you can send 5 text messages a day, but her replies are sent to the mobile phone, and there is no software like Fetion. Internet calls are still expensive, but now it is convenient to use the Internet in Vietnam. You can also chat online at an agreed time. If the Internet cafe there is close to the school, there will be QQ, or you can download Yahoo. Yahoo is commonly used there, so there must be Yahoo software in the Internet cafe. This will make it easier for you to chat. Because mutual transmission between China and Vietnam is relatively expensive, China Mobile charges 1 yuan per message to Vietnam, and Vietnam charges 2,500 dong per message. It is also very expensive to download SKYPE when making phone calls, it seems to be 3 or 4 yuan/minute. So it is more cost-effective to chat online.