Hi Manoj Gokhale,
Thank you for posting here.
According to your error, when you create the
account, have you change the password? Please remember, sending SMS will not work until you change first password.
Here is a similar thread about Send SMS From ASP.Net To Mobile using OneSixtybyTwo for your reference.
https://forums.asp.net/t/2116758.aspx?Send+SMS+From+ASP+Net+To+Mobile
Best Regards,
Wendy
MSDN Community Support
Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any compliments or complaints to
MSDN Support, feel free to contact MSDNFSF@microsoft.com.