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Delivered SMSes: Have been received by the subscriber, and the operator has sent us the delivery time.
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Pending SMSes: Have been successfully delivered to the operator, but it has either not provided us with the delivery time or it has not delivered the message for several possible reasons, such as if the mobile phone has been turned off or does not have signal.
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Undelivered SMSes: The operator has not been able to deliver these because the recipient number does not exist or is no longer valid.