Delivery Report Shows Under Message History

Stop the Doubt! Delivery report (DLR) shows under Message History

What is Delivery Report?

Delivery report (DLR) is a feature that gives you a feedback on the delivery status of every SMS message submitted. It is sourced directly from the handset through the mobile net carrier of the mobile number the message is sent to.

The DLR helps you stop guesses after you have sent a message, giving you the true picture of the status of the messages sent.

Know This About DLR

  • DLR is not available on all networks.
  • DLR is not sent for all messages received by the operators.
  • Even when the operator supports DLR, the time it takes for it to send report varies between 15 minutes to 48 hours after the message has been sent.

Different Delivery Statuses

Here is the list of the DLR statuses returned by the operators and what they mean.

  • SENT

Message was sent to the operator but yet to get any DLR.

  • ACCEPTED

Message was accepted by the operator for delivery.

  • PENDING

Message has been forwarded to the phone number and possibly delivered but the recipient’s phone is yet to reply the operator with acknowledgement.

  • DELIVERED

Message was delivered to cell phone.

  • UNDELIVERED

Attempt to deliver message failed, maybe because the handset of the subscriber is out of network coverage when message delivery was attempted or the handset might be switched off. The message might have failed due to suspicion of SPAM on the operator network e.g. use of reserved Sender ID relating to financial institutions or government agencies. The reason may also be due to random unsolicited messages blocked by the operator; or political campaign not permitted by the operator; or same message sent to the same phone number repeatedly over a short time; or the phone number might have been recycled after a period of no activity.

  • REJECTED

The message was rejected, maybe because: the subscriber is on the Do-Not-Disturb list; or the provider could have blocked phone numbers in this range; or the message flagged as SPAM (Mass unsolicited messages); or the message flagged as SCAM (Messages with potential intent to defraud, defame or threatens social security); or the network provider is having issues or they are currently upgrading their system.

  • ENQUEUE

Message was sent to the operator and forwarded to the cell phone but yet to reply with delivery acknowledgement.

  • ENROUTE

Message is being routed for delivery. 

  • EXPIRED

The SMS Center was unable to deliver the message in a specified amount of time (Message Validity), usually between 15 minutes and 48 hours. In some instances (especially when the operator is under traffic pressure), the operator might expire some messages instantly once it cannot be delivered as at first attempt. Message may also expire because the cell phone was switched off as at the time of delivery.

  • UNSUPPORTED

Delivery report is not supported by the route or the operator. 

  • DELETED

Message was deleted. 

  • UNKNOWN

The message has been confirmed as undelivered but no detailed information related to the failure is known. An unknown error might have occurred on the operator SMS server, or as a result of portability error.