How to diagnose the reason why the SMSs were not sent in the SMS Manager app

In the SMS Manager app, the users could send an SMS to a phone number or to multiple phone numbers. There could be some reasons why a SMS wasn't sent correctly to one or multiple phone numbers. The app saves the encountered errors and some of them could be seen even in the Twilio accounts.

 To get the errors saved in the SMS Manager:

• Go to the SMS Manager app.
• Click on the SMS menu item and on the desired SMS ID.
• In the weekly calendar at the SMS page you will see the SMS record in the sent date. Click on its time.
• A modal with all phone numbers the SMS was sent will be showed.
• Green icon means sent successfully. Red means the SMS wasn't sent.
• Below the red icon you will see a text message with the error.

To get the errors and details about a sent SMS in the Twilio account:

• Sign In your Twilio account.
• Click on Monitor tab.
• Click on the Messaging menu item.
• You will see the list with all sent SMS which you could filter.