Related terms

• Sent SMS
• Delivered SMS
• Pending SMS

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Undelivered SMS

The term "Undelivered" refers to the number of SMS messages that have not been able to be delivered to the recipients' mobile phones.

The reasons for this can be related to the device, for example: the recipient's device may have restricted SMS reception service, it may be turned off or out of coverage for more than 48 hours, or the phone number may not be associated with any user.

How can I reduce the number of undelivered SMS?

Recurring "Undelivered" contact numbers should be removed from your list because they represent a cost that will never be recovered. Periodically review your contacts and block or delete those that have not been delivered because the number is unknown or has been rejected by the carrier.