Do you want to open international roaming when GSM goes to Macao?

According to Zhihu, GSM needs to open international roaming to Macau. Before roaming in Macao, two functions of "international long distance and international roaming" need to be opened, and part of the deposit needs to be paid when opening. At the same time, it is necessary to explain to the business personnel not to turn off the data retention function, so as to choose the designated operator to realize the mobile phone Internet access function in the future.