To check if an approved SMS template works as transactional,

Copy the template,

Click on the SMS button on the top left, beside the ‘Call’ button on the Exotel dashboard

Type in a DND number (Check if that number is a DND number)

Paste the template in the SMS body or you can click ‘Choose an SMS template’                  

Replace all occurrences of %s (if any) with any set of alpha-numeric characters, something like this: rgb567kjb 

and click ‘Send SMS’

If the DND number receives the SMS, then the template is working as expected.