I changed the SMS center number set by SMS. How to change it back now

How to set the number of SMS service center: Please go to SMS-Menu-Settings-SMS Settings-Information Center-Set the number of information center in the lower left corner and contact the network operator for confirmation.

The number of the information center is the short message server. If it is not filled in correctly, the SMS cannot be sent successfully. Each region has its own information center number. Many mobile phones produced now do not need to be entered by themselves. If you are not sure, you can ask your local network operator. Mobile question 10086, Unicom question 100 10.