First of all, we need to apply to the three major operators to activate international SMS services.
China Unicom number, dial 10010;
For mobile numbers, dial 10086;
Telecom number, dial 10000;
Manually explain how to activate the international SMS service, which means that the systems of the three major operators are required not to intercept overseas SMS messages and are required to cancel overseas interception.
If you cannot call manual service at night, you can also apply via text message.
China Unicom number edit text message KTGJDX to 10010
Mobile number edit text message 11111 to 10085
Telecom number editing text message 1031 to 10001