My mobile phone Nokia 1200 failed to send SMS?

Last night (New Year's Eve), I also encountered such a problem. I was so angry that I dropped my mobile phone several times. In order not to let everyone suffer this crime again, I wrote the following answers to friends in urgent need:

1, wrong information center number (information center number: +86 13800577500)

2. The sending mode has been changed. You can try changing the sending method to 1.

3. The phone is not in good contact with the card. Please turn it off 10 minutes. You'd better take out your mobile phone card and put it back.

4, the phone is in arrears, call and try.

5. The other party blacklisted you. Try sending messages to other friends.

6. It was the problem I met last night, and it was also the problem of the landlord. Outbox is full. You have to go to the outbox and delete all the information one by one, and your problem will be solved immediately.

7, the signal is weak, you have to change the position to send.

8. The Internet is busy, which will happen on major festivals. It'll be all right in a minute.

9. The card is broken. Try it on someone else's mobile phone. If it still doesn't work, that's why.

That's all I know. I hope I can help you.