The SMS function can't be used. what's up

1, mobile phone security software intercepts, you can turn on the mobile phone security software, temporarily turn off the interception function, and then try to send a short message;

2. Non-Chinese mainland mobile phone number;

3. The short message gateway is congested or abnormal, resulting in the delay or loss of sending short messages. You can contact the mobile phone operator for verification or try to send or receive SMS again after a period of time;

4. If the frequency of sending short messages is too fast, you can try the operation again after a while;

5. Card replacement test: change the mobile phone card to another mobile phone to receive the short message, and try again.