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E_MBN_SMS_NETWORK_TIMEOUT
E_MBN_SMS_NETWORK_TIMEOUT is a Windows Mobile Broadband (MBN) HRESULT. It indicates that the SMS request did not receive the required network response before the Mobile Broadband timeout expired.
What to check
- Check registration state, signal conditions, roaming policy, and SMS service availability before retrying.
- Use bounded backoff and deduplication because a timeout does not reliably prove that the network never received the message.
- Capture the request ID and delivery status when available so a repeated send does not create an unintended duplicate.
Microsoft: IMbnSmsEvents::OnSmsSendComplete
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