best will be to set the message centre number over again from the message settings............look for the sim pack manual for the message centre number.
To make it easy you can insert the sim in a nomal phone (not a smart phone)
go to the message settings and make the changes from there.
re-insert the sim back in your smartphone and try sending messages again.
Another option
enter *#*#4636#*#*
should display a "Testing Menu"
Choose phone information and scroll till you find "SMSC" section
click on "refresh" and if it gives an error then you will have to enter the message centre number in an international format and click on "update"
Note that sometimes the message number can be in a code form and that will need to be converted before entering that code read more here
SMSC Updates CyanogenMod )
Please do let me know the outcome.
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