An SMS message is stored temporarily in the SMS center if the recipient
mobile phone is unavailable. It is possible on most mobile handset to
specify an expiry period after which the SMS message will be deleted
from the SMS center. Once deleted, the SMS message will no longer be
available for dispatch to the recipient mobile phone (even if it becomes
online). The validity period should be regarded by the handset user as a
request, as the SMSC itself can be configured to ignore or otherwise
handle message delivery schedules.
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