Why Cant I send SMS through API ? Web Admin April 09, 2018 06:28 Updated Send SMS through API Could be The reason is your username, password are incorrect. Double check if you still get error please chat with our support team . Related articles Is your API secure? Application programming interface (API) What is Economy rout ? HTTP Encoding Why are Unicode messages limited to 70 characters? Comments 0 comments Please sign in to leave a comment.