Does Telecom need to open international roaming to Macau?

Telecom should open international roaming when going to Macao. In Macau, you can't make a phone call directly from Chinese mainland Telecom's mobile phone. You need to open an international roaming service online, or go to the official business hall of telecommunications to handle it, and then you can answer the phone normally. Otherwise, you won't receive phone calls and SMS reminders.