How to change the SMS center number on Android phone?

First click the contact icon, switch to the dialing panel, and enter "*#*#4636#*#*" (without quotation marks) in the panel. After a while, the phone will enter the Testing menu and select the first item, Phone information. After entering the Phone information menu, move the screen to the bottom and click Refresh on the SMSC line to display the current SMS center number and check whether it is correct. If it is incorrect, please check the SMS center number of the local network used, fill it in the input box next to SMSC, click Update next to it, and finally close the Android phone.