Message delivery error (21608) in temperature sensing project

I have verified sid,from number,to number,autth_key everything was correct but iam getting this error.


As the error indicates, you need to verify the number to which you are sending the SMS from Twilio dashboard first.

Please visit your Twilio account and verify the number. Once that is done, you should be able to proceed further.

if this error shows up …you have probably not verified the number which you want to send the sms to or you have entered the wrong phone number in file.
To verify go to phone numbers->verify caller id->click on the + button and enter the number you want to verify.