There can be different reasons for failing of an SMS such as exception time out, message inbox full or if the number is out of reach.
These are the basic reasons for the failure of an SMS:
EXP Abssubs - Subscriber is not available at that time
EXP Memexcd - Inbox memory is full or exceeded
EXP Smstmout - SMS timeout after all retry
EXP Nwfail - Network failed
ABSENT SUBSCRIBER- Unidentified Subscriber, No response from the handset.
NUMBER TEMPORARILY UNAVAILABLE: Number out of coverage area/ Switched Off.
Failed - No specific reason found for non delivery (after certain attempts by multiple operators)
Rejected by Provider: The SMS were rejected by the provider due to the promotional content through transactional route.
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