I cannot able to find the message center option in message settings.
The SMS message center number is normally read from the SIM card, and should not be altered, normally. But if needed:
Dial *#*#4636#*#* and tap 'Phone information' in the menu.
Scroll to SMSC: and tap the Refresh button to view the current number.
Input the new number and tap Update.
Please note the formatting is "+??????????",145
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