I have seen that some of guys reporting that they can't send message from their mobile. While trying to send sms they got a error saying error 21.  I am not sure that this method will work for all of you, but you should try this once.  Try this step by step:-     1. Go to phone's dialer and dial *#*#4636#*#*   2. This will open a new window. Here tap on phone information.         2. Now scroll down for SMSC.      4. Here tap on refresh.      5. Now your SMS service center number will appears , just check them if they are ok, than tap on update.   That's it. You have done. I hope this will fix your problem. If still you are facing problem let me know in comments section i will help you.   


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