Does it mean, Mautic sends to Twilio - Twilio gives it a try - but when the handset is switched off, it will not retry to deliver at a later time and wait for another API Call to do so?
Do you know if thats the way its implemented in the Twilio Plugin?
The network provider does not queue messages that encounter Error 30003. This error signifies that the message delivery failed because the destination handset is unreachable.
Twilio does not automatically retry messages that fail with Error 30003. If you encounter this error, you should manually attempt to resend the message at a later time.
Your application should handle the retry logic. Twilio does not automatically retry messages that fail with Error 30003. If you encounter this error, you should manually attempt to resend the message at a later time.
OK - if Mautic isn’t doing it either… than its a very unreliable channel.