Whatsapp China cannot send verification SMS, whatsapp prompts to try again after 1 hour? What should I do?

First, we need to apply to the three major operators to open international SMS services.

For China Unicom number, dial 10010;
For mobile numbers, dial 10086;
Telecom number, dial 10000;

Manual instructions are provided 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.

Text message KTGJDX to China Unicom number to 10010
Mobile number edit SMS 11111 to 10085
Telecom number editing SMS 1031 to 10001