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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