289703d4_eway_HTTP_XML___txtNation_Wiki__Final_status_
[Report] VALIDITY_EXPIRED [Description] The message could not be delivered to the end user as the validity period expired. An SMS message is stored temporarily in the SMS center / network operator if the recipient mobile phone is unavailable, e.g. off / out of reception / flight mode / any other reason that the phone can't be contacted. Once deleted from the network's temporary store, the SMS message will no longer be available for dispatch to the recipient mobile phone (even if it becomes online). Mobile networks only store text messages for a limited time as there is a limit to available space in which to store the messages. [Retries possible?] ✔ [Final status?] 
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Gateway HTTP XML - txtNation Wiki
Final status?