Multiple reasons account to message failure, which is listed below:

  • Exception Time Out
  • Message Inbox memory is full on your mobile device.
  • The number is out of reach (not reachable/ out of coverage area)
  • Momentary unavailability of subscriber
  • Handset failureĀ 
  • Network failure
  • DLT Scrubbing - Template Does not match, senderID does not match, etc.