How to send text messages on Nokia mobile phone 7 120c?

There are only two possibilities for information not to be sent:

1: There is something wrong with your mobile phone card. Please change the card first. If you still can't send it out! Look at the machine!

2: Your mobile phone information is set incorrectly or has been changed! Need to reset the information center number.

The format of this center number is+8613800 * * * *, which represents the area where your card is located. You have to ask 10086 about this. (I'm talking about a mobile card) If it's a Unicom card, you have to ask Unicom!

If the operation is not successful! You can always ask me online!

I hope you succeed!