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I am using xperia arc s , and i am unable to sends sms from my phone, as i contacted service provider , he asked me to check the mesg centre number , but i didnt find it ny where , could u please help me changing mesg centre number ,
I tried changing smsc which came up on pressing *#*#4636#*#* , but its showing as update error
Could anyone please help me how to change message centre number in settings , please
By the way my phone is runnig on ICS ,
please help with the issue
what exactly happen when you dial this *#*#4636#*#* ?
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We get a list saing phone information , battery information and
wifi information another one i dont remember......
Tap Phone Information, scroll down to SMSC field, key in your message centre number in the blank field and tap Update.
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as i mentioned in the question , i am unable to update , its saying update error 
its saying update eroorrrrrr
did you unlocked your bootloader?
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unrelated topic, if you have some time please check this thread
Dial this *#*#4636#*#*
Go to SMSC:________________ Update Refresh
Click on Refresh.
Enter the Service Centre No. in the SMSC Box As "+919434599997".145 (This the example. The last three number will come as per your service provider)
Press Update
It will definitely works