12306 The registration verification code always needs to be reacquired. Sending SMS 999 always fails. Why?

Registration 12306 Sending SMS 999 always fails. Generally speaking:

1, texting 999 will never go out.

2. The SMS has been sent, but the verification code has not been received.

3. The SMS has been sent and the verification code has been received, but always get the verification code first when filling in the verification code.

In view of the above three situations, the possible reasons and solutions are as follows:

1, the mobile phone number is wrong. See if your mobile phone number is correct.

2, mobile phone problems. Try sending text messages on different mobile phones to see if you can't receive them.

The cell phone signal is very poor. Try somewhere else.

4. Error in SMS function. Check whether the SMS function is normal.

5.sim card problem. Check whether the sim card is loose or has other problems after long-term use.

6. The number of verification messages sent on the same day exceeds. A mobile phone number can only get the verification code three times a day to see if it exceeds the number of times of the day. If it exceeds, try again another day.

7. The mailbox is full. Please delete some messages and try again.

8. The mobile phone has two cards, so you can send text messages with the wrong mobile phone card. Try sending a text message with another card.

9. SMS interception software is installed on the mobile phone to verify that SMS is intercepted as spam. I'm intercepting information. Look for it.

10. If all the above methods fail, you can manually dial 12306 and ask the customer service to give the verification code directly.