i just changed my sim card. and then i have a problem. i can receive sms but i cant send sms. i figured it's because the sms center setting cleared, but i didnt find any sms center setting. my friend told me to try *#*#4636#*#* i found SMSC in phone information and i fill +6281100000 but i cant hit update. it wont be saved anyone experience the same problem? do you have solution?