Quick answer
If an SMS is not delivered, the delivery report usually shows why. The most common causes are:
- Template mismatch. The text does not match the approved DLT template exactly. See template mismatch error.
- DND number. Promotional SMS do not reach numbers on the DND list. See DND error.
- Link or number not whitelisted. URLs and callback numbers in the SMS must be whitelisted on DLT. See whitelisting.
- Wrong header or template link. The template must be linked to the header you are sending from.
- Invalid number. Wrong length, landline or a disconnected number.
- Phone off or out of coverage. The operator retries for a while, then marks it expired.
- Promotional timing. Promotional SMS outside 9 AM to 9 PM are not delivered.
Still stuck? Send our support team the number, time and message ID, and we will check the route for you. Contact us.
More questions
Why do some numbers get the SMS and others do not?
Usually because some numbers are DND, invalid or switched off. Check the status for each number in the delivery report.
Why do SMS to one operator fail?
Share the details with our support team. We can check and switch the route if needed.
What details should I send to support?
The mobile number, sending time, message ID and the exact text you sent.
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