S M S A R E N A

The  undelivered status means that the SMS did not reach the specific number. Some reasons that may cause the undelivered status are:

  • Roaming Error
  • Call Barred
  • Absent Subscriber
  • SMS Expired: the SMS by default tries to be delivered for 48 hours, after this time frame the SMS is marked as undelivered due to expiration

The invalid numbers are numbers which do not exist and for that reason the SMS cannot be delivered.

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