Can China Mobile GSM roam in Vietnam?

Hello, yes. If you are a customer of Jiangsu Mobile, you can use it in Vietnam by opening the international long-distance call and international roaming function. Calling Chinese mainland in Vietnam is 2.99 yuan/minute, answering the phone is 2.99 yuan/minute, calling local Vietnam 1.99 yuan/minute, and calling 3 yuan in other countries (except some countries). Send a text message back to Chinese mainland at 0.99 yuan/piece, and send a text message to other countries 1.89 yuan/piece, and the reception is free. For your reference, thank you for using China Mobile Communication.